>>4516
Some quick ideas:

-Rainbow is an athlete, so maybe she could use her limbs as dumbell, or her inflated womb/stomach as a fitness ball/punching bag?
-Skull could be used as a cup, or if you're feeling very dirty, a toilet.
-Skin for clothes is the usual thing, but there are other uses. Why not have her use the whole hide as a rug, like a trophy? Or turn it into a sports bag for her gym equipment? Or as a windsock-she lives on a cloud, after all.
-The pussy, ass and/or tits could be preserved as sex toys.