Could use as a seat pad to keep your butt clean, warm, dry and unbruised when sitting on dirty, cold, wet and/or rocky terrain. No duh :p
Could use as additional padding for your shoulders and/or hips when using a sleeping pad that would otherwise to to thin to be comfortable or warm enough.
Could use as a pillow if folded up at least part way.
Could use as structure and support in a small backpack that does not otherwise have a frame.
Could use as an emergency back-country splint for a sprained or broken appendage.
Could use as a brightly colored signaling device to get attention in an emergency.
Could use to store your robin's egg collection while out in the field.
Could maybe use under a fire pan or a stove when snow camping to keep your fire or stove from sinking into the snow.
Could use to protect your car seat when you climb in after a wet muddy mountain bike ride.
Could use as padding between bicycles or other delicate equipment when packing into the back of your car for transport. . . or use as padding between your nice car and protruding cargo parts like bike pedals, chains or whatnot.
It would make a great diaper changing pad.
Could use it to protect your bottle of scotch (or other "delicates")inside your pack, while hiking in the back country.
Dang, this might just be the ultimate multi-use item. Maybe this is the wrong forum topic for this ;)