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, beige/jet black, sports & cold weather pkgs, comfort access, logic 7, sat radio, Miro M6 wheels (with Michelin super sports), M6 spare tire, tint, windscreen, triple resonator delete, m-tec v3 AE's bulbs, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for wife - no mod's
'04 Acura TSX (daughter) and '12 VW GTI - Autobahn (son)