If you are brave/good with a rattle can you could try http://www3.towerhobbies.com/cgi-bin...?&I=LXFFV5&P=7 and back it with black. With the translucent color, the more you spray the brighter it would be. So 1 coat of silver backed with black would be darker than 2 coats silver backed with black etc etc. The only issue would be even coverage, it could have light and dark spots depending how even your spray is.