I would expect installing a new dome light wouldn't be too hard. Just take off the casing (I'm not sure how of course, I've never checked it
) and replace the bulb.
If you're going for blue/white, you might look in to slightly blue-ish tint on the windows. If you get the right type, it might just look pretty good (maybe you can post a few pics of your car?).
And if your only problem with the rims is the red on them (I assume you mean the small red circle in the middle), I would just paint over it, make it blue.
Not sure on the window decal. It would depend on what it looked like, how big, and all that - your call, really.
As for mods, I would personally love to have a Turbo, but there is no way in hell I could afford one right now
I'm very happy with my AEM Cold Air Intake
(only problem is a Check Engine Light because the computer is detecting a hose that is no longer used, but Performance-wise, I love it. It also has a great sound - A psshk! when you stomp on the gas, a low rumble at the lower RPM's, then it gets quiet, and comes with a nice deep rumble around 5k RPM, then gets slightly quieter, then screams as soon as lift kicks in just past 6k.) I imagine an exhaust would make it even more of an experience (I'm looking at TRD
or TSRM exhaust for my next mod, after MTECH lights).
I think I got all that right.
Do you have pics of your car w/ the neons?