I wanted seat covers due to blacksmith grime, but the cheap KMart set I got didn't fit, I ended up chucking them out except for the seat belt cushions.
Later I picked up a couple cheap heated seat rigs, $20 each, so my girlfriend's seat remains hot whether she's driving or not. They also serve as seat protectors, so dual use. Winter's winding down though, so it would be nice to find something else to cover the seats with to protect them from me... just haven't seen anything that actually fits, the standard kit stuff sold in pep boys/autozone/walmart doesnt' seem to work on our seats very well at all.