Can you buy sidemarker bulbs in any color but amber? I dont live in the US so Im not restricted to which color I use for blinkers etc...

Also, how difficult would it be to change the color of the dash/interior lights from red to green?

 

green interior lighting a la SAAB would look sexy...

It shouldn't be too difficult, it will just take a crapload of time.
I did that with a friend of mine, changed his G35 lighting to blue.
Basically you just replace all the little red LED's in your car with green ones...

 

Hope you're not talking about the cluster was well... they aren't exactly LED's.

more like, lots of 3mm squares of these:

 

Ahh... okay, so it's not really a feasable option. thanks for the heads-up.

 

theres reasoning behind red, btw, that end of the spectrum is easier on the eyes, aka, little/no eye strain at night. blue would be the worst, other end of the spectrum.

i want(ed) to change the white numbers to red as well. my A4 was all red, i like that alot. i have a spare cluster 'face' to use for a template and someday try to make my own color/design. i also like the idea of putting an image of the TT badge on the face, centered on/over the speedo and tach needles.