I also changed out all my interior bulbs for LED bulbs (the Ziza LED kit from ECS Tuning) - whiter bright light and I like the result. See pics and extensive discussion of pro's and cons on this thread.
I also changed out the fog light bulbs but dropped the bumper to do it - it was real easy to drop the bumper following the DIY in our six DIY section. Here's another thread discussing the fog's and angel eyes with pics.
'07 650i vert, creme beige/jet black, sports & cold weather pkgs, comfort access, premium sound, sat radio, Miro M6 wheels, tint, windscreen, triple resonator delete, 5W bulbs, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for the family - no mod's