I would show you if I had ps, but I think doing them black with a red outlined running horse that is big so it sort of goes off the panel. but have the horse at an angle, not at the angle of the panel.
There are several from mike that I like too though.
Get ahold of wheelchair james or better yet, his friend Ryan jenkins.. The kid knows some lady who does vinyl decals that look great.. Shes actually the one doing my Saleen decals. Check into that.. im sure she can hook you up with ponies facing the same way for each side..
Ask her to do them in the thinest mil vinyl possible.. So you dont have a pronounced edge.