I replaced my dome, rear hatch, and license plate with (blue--to match my car) LEDs off of eBay; I like the soft glow. I didn't do the map/reading lights because they really never get used. I'm kind of wondering if it's a common bulb type though (haven't popped the covers to look).
2011 Blue Ocean SV w/floor mats & window tint
Lithium Pros 12v LiFePO4 battery w/Antigravity Battery Tracker
FIAMM 74100 horns
Wet Okole seat covers
Tor's low-power heater mod
2013 sun visor
Battery Pack replaced (Rev E) @51 months and 41k miles