You want "Xtreme White" bulbs: PIAA
3157 &
194.
^Blue when off but then "white" when lit, completely illegal if you're trying to put these in your turn signals - unless they're in an amber housing, but I'm guessing you'd use your black lenses.
Sylvania makes a
3157 SilverStar bulb that's blue/amber when off and amber when lit, they're really bright and you can pick them up at the auto store.
I went with some chrome/amber bulbs from
DDM Tuning. These work pretty well, not too bright when lit but blend in really well with the clear corners when off.