Get some old sheets and sew them together, that's what i did..... If you can't sew use the iron on stuff, it's easy to use.
I've got an outdoor cover made by "coverzone". Had it for years. It has been excellent, well made and never marked the car. good tailored fit.
Cheers Guys, still looking.....
2008 R56 COOPER S, Pepper White, Black Roof, 'John Cooper' Signature Side and Bonnet Stripes, JCW 'Stage 1' Tuning Kit, Forge Intercooler, Milltek Downpipe & Sports Cat, ALTA Induction, Chris Knox/DNA Remap, JCW/Brembo Brakes, Limited Slip Diff, JCW Suspension and Front Strut Brace, 17" Crown Spokes with Non-Runflat 205/45x17 Michelin Pilot Super Sport tyres, JCW/Recaro leather Seats, JCW Sideskirts, Chili Pack, Front Spotlights. Still got my old Hendrix Badge blu-tacked to the dash!
Spotted this on Ebay - Might be of use to you and what your looking for...
Would have been better to have seen a picture of the actual cover itself though...
http://cgi.ebay.co.uk/BMW-NEW-SHAPE-...#ht_500wt_1156