Here is the design for the Yellow Divine..... I think! I don't know what the name is yet. It could be for the piñatas or something though.
I'm sorry if this is not the Yellow Divine. I got it from the INT server.

Shiny Yellow in the piñatas

The Piñatas are next. There is 21 Piñatas. At Piñata no. 18 you will win a Greyfell Divine. At 21, you will win Shiny Yellow! Here is the list of objectives and prizes:

Pinata Objectives, end of April promo.

Pinata 1 (snailcup) = 3pts

obj1 : click on your pinata - 1 point

obj2 : groom one of your horses = 1 bonus click

gifts: 3 Aging Points and 1 Pandoras Box

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Pinata 2 (sunflower) = 6pts

obj1 : stroke a horse = be able to be helped by 4 friends

obj2 : bed down a pony = 1 bonus click

gifts: 10% energy for all your horses and one 2** saddle cloth

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Pinata 3 (fishflower) = 10pts

obj1 :congratulate a player = 5 pts for the pinata

obj2 : visit Ows page = 1 click every 12h

gifts : one 2** bonnet and a whip

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Pinata 4 (babycrispa) = 15 pts

obj1 : sell three mashes = the next 5 clicks by friends earn 2 points each

obj2 : donate (something) to Ow = 5 bonus click

gifts : 10 mashes and 1 Water of Youth

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Pinata 5 (shadower) = 20 pts

obj1 : enter a horse in a competition = next 7 clicks gain 2 points each (not including clicks from friends)

obj2 : click the pinata of a friend = be able to be helped by 6 friends

gifts : 50 apples and 1 Philotes' Stroke

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Pinata 6 (woofer) = 25 pts

obj1 : specialise a horse = points needed divided by two

obj2 : give an apple to a divine or wild horse = be able to click once every 6 hours

gifts : 100 wood , 100 sand and 100 iron
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pinata 7 (brokenleaf) = 30 pts

obj1 : find a treat when feeding a horse = clicks give 2 pts (excluding clicks from friends)

obj2 : train a horse for 3 hours at once = 10 points for your pinata

gifts : one 1* classical bridle, 20 leather and 1 Helios Ray

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Pinata 8 (buddy) = 40 pts

obj1 : donate (something) to Ow = next 4 clicks earn 3 pts each (excluding clicks from friends)

obj2 : last click on a friends pinata= be able to click twice every 6 hours

gifts : one 1* classical saddle, 10 Aging Points and one trough (feed trough or water trough???)

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Pinata 9 (tentaflow) = 50 pts

obj1 : finish last in a competition = 6 bonus clicks

obj2 : win 120 equus with Plutos Parchment = be able to be helped by 8 friends

gifts : one 2*polo wraps, bell boots and one Plutos Parchment

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Pinata 10 (tricob) = 60 pts

obj1 : win 1 equus in a competition= 15 pts for the pinata

obj2 : use an Aging Point on a 15 year old horse = 5 bonus clicks

gifts : 300 fodder, 500 points for the general ranking and one Hypnos Blanket
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Pinata 11 (fanseed) = 80 pts

obj1 : finish 3rd in 3 competitions = clicks from friends give 2 points each

obj2 : be congratulated 6 times = pinata opens with the next click

gifts : one 2* polo wraps, one 2* bonnet and one 2* saddle cloth (I'm guessing the special pinata design)

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Pinata 12 (floover) = 100 pts

obj1 : participate in a competition requiring 12% energy= next click yields 20 pts (excluding clicks from friends)

obj2 : donate (something) to Ow = 2 clicks every 3 hrs

gifts : 4000 equus , 1 Medusas Blood and 1 Achilles Heel

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Pinata 13 (auratus) = 150 pts

obj1 : stroke a horse with a flaxen liver chestnut coat = can be helped by 10 friends

obj2 : open a Horn of Plenty = number of points already collected for this pinata multiplied by 2

gifts : 20 carrots, one Piece of Cloud and one Zeus Lightning Bolt

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Pinata 14 (cobby) = 200 pts

obj1 : win at least 1000 equus with the same horse in competitions = all clicks yield 3 points (excluding clicks from friends)

obj2 : participate in 60 competitions requiring 20% energy each (in the past, it was okay to use 20.1 to 20.9 energy competitions, and the total the player had to do was related to the number of horses owned - just my experience) = number of points needed to open this pinata divided by 2

gifts : 100% morale for all your horses, one Croesus Fortune, and one Golden Apple

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Pinata 15 (kiteblossom) = 250 pts

obj1 : congratulate a player on his/her birthday = next 10 clicks gain 5 points each (excluding clicks from friends)

obj2 : fully equip a horse that has never been fully equipped before = friend clicks earn 4 points each

obj3 : finish training in one skill = 100 pts for your pinata

gifts : 10 Aging Points , a tractor and a Chronos Timer

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Pinata 16 (slugeyed) = 300 pts

obj1 : buy a horse for 2000 equus = number of points gained raises to 120 pts

obj2 : donate (something) to Ow = next 10 clicks from friends gain 5 pts

obj3 : accept an exchange of items = 3 clicks every 3 hours

gifts : 100 droppings , a shower and one Poseidons Pack

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Pinata 17 (paraflora) = 400 pts

obj1 : give a carrot to a horse born to ouranos and gaia (foundation horse) = 10 bonus clicks

obj2 : stroke a horse over 40 years old (non-divine and non-wild) = all clicks yield 5 points (except clicks from friends)

obj3 : reach blup100 with a horse = 120 pts for the pinata

gifts : 6000 equus , a lunge and a 5th Element

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Pinata 18 (floctopuss) = 600 pts

obj1 : give a mash to a horse with 231 to 323 skill points in dressage = 10 bonus clicks

obj2 : find a hoof pick with a horse between 7 and 8 years - be able to be helped by 12 friends

obj3 : groom a donkey = number of points already gained multiplies by two

gifts : 20 mash , 1000 pts for the general ranking and a Nyx Pack

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Pinata 19 (bulbion) = 1000 pts

obj1 : win 25 competitions = be able to click 3 times every 2 hrs

obj2 : donate (something) to Ow = next 10 clicks from friends yield 10 points each

obj3 : buy a horse for at least one pass = pinata opens on next click

gifts : 15 Aging Points , one Hera Pack and a Greyfell divine

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Pinata 20 (fringedcone) = 1500 pts

obj1 : 2 wins with a horse born from ouranos and gaia (foundation horse) = 10 bonus clicks

obj2 : use a Helios Ray for a blue landscape = clicks from friends yield 10 points each

obj3 : have a breeders reserve ending in 11 111 = 1000 pts for the pinata

gifts : 10 000 equus , one Philosophers Stone and a Themis' Scale

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Pinata 21(helianthus rex) = 2000 pts

obj1 : remove a unicorn's horn = clicks yield 10 pts each

obj2 : give birth to twins = 15 bonus clicks

obj3 : win a rosette in a competition = number of points needed are halved

gift: divine horse Shiny Yellow

This is what they look like

these are the names of the rest of the Rainbow Divines:

Forest Green.
Lovely Blue.
Devoted Indigo.
Brave Purple

Yellow will breed with blue to produce green.