If i had to pick, i like the 4th picture and some in the 5th picture, other then that i would only do it if my car was pretty enough to get such flashy things, or it matched the paint somewhere else :P
samples here, although in my opinion some are a bit too much colorfull:
http://i11.ebayimg.com/01/i/000/9c/04/81f5_1.JPG
http://i23.ebayimg.com/01/i/000/9c/04/81c6_1.JPG
http://i10.ebayimg.com/01/i/000/9c/04/6257_1.JPG
http://i24.ebayimg.com/03/i/000/9c/04/62df_1.JPG
http://i15.ebayimg.com/03/i/000/9c/04/631c_1.JPG
http://i15.ebayimg.com/03/i/000/9c/04/631c_1.JPG
http://i11.ebayimg.com/07/i/000/9c/04/6299_1.JPG
http://i11.ebayimg.com/01/i/000/9c/04/81f5_1.JPG
If i had to pick, i like the 4th picture and some in the 5th picture, other then that i would only do it if my car was pretty enough to get such flashy things, or it matched the paint somewhere else :P
///M stripes on non ///M cars looks cheesy.
A couple of those are pretty cool looking.
InDEuroz | e34 540i/6 '94 w/ bore/stroked m62 | e30 325iS '87 | Ducati 748R '00
I think the black looks good.
M20 525/7 Bore: 84.50mm Stroke 81mm CR 8.5:1, blue printed/dyno & custom chip. Boost @ 6.5psi ~246hp @ 5300rpm / torque @ 269ftlbs. @ 4250rpm
Black for the win. Although some of the more colorful ones look nice too, they'd be more suited to a modified engine rather than a stock one. Especially, as mentioned, M-stripes on non-M engines.
the black ones the best without a doubt
Basic black.