These are single-piece solid-color ponies, sometimes sold in buckets or tubes.
Pink:
Pink w/ glitter:
Purple:
Orange:
Blue w/ gold glitter:
2″ long glitter unicorn:
2″ “skeleton” horse (the plastic is sooo thin, it has a skeletal appearance):
These are from a set that are the same single color principle but actually have pretty nice details. There are ponies, a dragon, and fairies.
The rearing unicorn comes in two sizes but the mold is very similar. One is rearing slightly taller:
Larger version:
Smaller version:
