What about Darcy Ashton appliqued horses:
http://ashtonpub.com/books.htm
She's a member of this board. Look at some of her quilts:
http://www.quiltingboard.com/search....+ashton&u=&s=5
(look at the 5th one - it's really cute!)
She also has one free horse pattern on her website.
You can do needle turn, or just use raw edge applique using the paper backed fusible. Wouldn't that look cute with horse fabric borders and maybe some bandana material for sashing.
Now I want to do a horse quilt!
I also bought a kit a while back from Fons and Porter that had horses in it. The lady designed it also does all those crazy adorable cat fabrics but her name eludes me right now. Having a senior moment - AGAIN! LOL
Okay - found the name: Laurel Burch Dancing Horses
really cute fabric