Using a sleezy or an old stable sheet, buy a bunch
of silk flowers, pop the heads off and hot glue to the sheet so that the sheet
is covered in flowers and greenery. Rider dresses up as a bumble bee or
butterfly. Totally cute.
Same idea but paint the sheet or sleezy in tree
camo colors and rider dresses up like a bird with a nest around the riders
waist.
At mule days (I think it as mule days) one year I
saw a motorcycle costume. The horse was the motorcycle and for the reins they
had sticks attached to the reins covered in tin foil and curved so that they
looked like the handle bars of a chopper. They had a black drape over the
horse and had a cardboard wheel on either side by the horses hip and
somehow using the breast collar as an anchor they made out of tin foil a
"chopper fork" that stuck out of the front of the horse with a cardboard wheel
attached. The rider dressed up in black leather. Hard to explain but
it was really creative.
