My only concern using these in quilts is that these sheets have chemicals in them and they also are very flamable.
Not worth the risk to some other human being if there were to be an accident where it could catch fire.
Now I have seen mixed media artist use these in various forms of papercrafting, even using crayons, inks and such to create speicality paper with it.
I suppose one could use it in things like quilted purses, or wall hanging and such but don't think I'd chance it for a quilt someone would use.