on designboom today i saw these fabric footballs by swedish designer klas herbert ernflo. they come in a variety of different patterns, all in wool at a 1:1 scale, and (as the original article also observes) looks like they would be great for use indoors, given that the soft material is much more forgiving on interiors than leather is. you wouldn't want to ruin it by using it outside anyway.
the website says that they are in production and for sale soon, so hopefully i'll be able to update this soon!
link to designboom article
link to klas ernflo homepage