Below is a summary of all of the unofficial ponies, and grouped by body colour:
*Earth Flitterheart 2 picture is courtesy of pineapple. Thanks pineapple!
**Sweetie Blue and Yellow Baby Unicorn pictures are courtesy of Sarah-Bee. Thanks Sarah-bee!
***Thankyou to Rhini for capturing photos of prototype versions of Cadance and Shining Armour at the MLP Fair 2012.
Thanks also to Starie and Itajn and others from MLPArena for assisting in pony spotting.
If you see an unreleased variant somewhere, send me pics on MLPArena. My username is BrightIdea.