If you could find any vinyl seat covers that are both cheap and decent looking, show them to me. Custom fits ones always look best but you pay out the ass for them.
How cheap do you want to go here? My friend removed and painted both grills and the plastic piece around his gauge cluster white (on a black P5). The can of paint costs three bucks and the work is easy to do. Painted calipers are also good looking cheap mods.