I usually do not post here links to collectors' sites. But as I am a Porsche fun (maybe you know it), I want to inform you about five site with Porsche models only which I know. Tere are the links:
In the last site you can see really tons of customs made raing Porsches like in the following images. Therefore, anybody of you who want to customise your Porsche model, you can contact the two German guys who made these beautiful models. Maybe, they can supply wyou with decals. To translate the site to English use http://world.altavista.com .
... and do not say me thank you for the links.