Have done this with my old cutting stallion (a brilliant gold palomino, shoulder length mane, street length tail, 3 stockings and long forelock…and a ham in parades). Used LED lights rather than the dollar store ones…brighter and last longer and could be programmed for sequental on/off, fast/slow etc. Duct taped battery pack to the cantle of my cutting saddle and used electricians tape on the wires and wove the lights into his tail. Same thing on his mane…taped battery pack to the cinch keeper on the front of my saddle, ran wires up through the gullet and wove into his mane. Did red/green/gold sparkles on his feet and lightly dusted on his butt (used spray adhesive lightly and then dusted). Biggest problem for him… about half the floats had lots of lights covered by lots of balloons…neither lights nor balloons usually bothered him at all but together the balloons glowed…he wasn’t sure that was OK at all until he sniffed a few of them and discovered they were his old friends from sacking out (I tie everything under the sun onto youngsters when sacking out…balloons, crepe paper stringers, tarps, walmart bags, those foam noodles the kids use at the pool in the summer…you name it I’ve probably used it…nothing phazes these kids when done!). Santa hat with ear holes and the one silver loaded headstall I had. He was such a show off…hammed it up by dancing sidepasses, doing pivots, bows, offered to “shake hands” with one of the clowns…this horse loved a parade!
PS…nurses routinely check for good battery charge by touching to tongue…barely a tingle is a good battery.