I know its not a SAMMIO SPYDER but if you click on this link
http://www.busselecta.com/porsche/
and pick 550 SPYDER from the Model list , you can customize your car's colour amongst other things and the 550 isn't so far away from my Spyder , stylewise , that it can't hurt to try out some colour options before you buy that paint !
If for no other reason ....its quite good fun !
The same site has VW Beetle , Camper etc. and kids ( and adults ) love customizing them on screen .....its very clever.