Never done it myself but I believe you can use the rear side window roller blinds for cars. The mesh makes the effect look good.
http://www.ebay.co.uk/sch/i.html?_nk....c0.m270.l1313
or
http://www.ebay.co.uk/itm/NON-SLIP-D...item5d294f0089 you tube has some demo,s