Well, you *could* have the seats redone in a more traditional fabric, it wouldn't be very cheap but it could be done. Or if you really had some bucks to burn you could do leather and have something that would last a good long time if cared for properly.
These neoprene seat covers cost me under 20 two years back. Haven't seem them at the local shop for a while. Funny thing is that the manufacturer made them in only in Insight colors... Red, grey, and blue. They match fairly well too![/url]
I'm not sure I would be able to get OEM material. I hadn't even considered it actually. I would probably just stitch up a similar pattern using a combination of fabrics (the mesh seat covers actually circulate air quite well, so I would want to preserve a similar material in that area).