http://app.volkswagen.de/ihdcc/de/configurator.html
I just played with the GTI. I didn't see custom color options. The GTI in Germany looks to get limited colors as it does here, but you can get Limestone which you can't here, and there's no red or plain white (only pearl). Wheels are 17" stock as opposed to our 18, and I don't see the 19" option other markets get, though they do offer a number of accessory wheels that the US configurator does not. The options themselves are crazy. It's much more al la carte, like a Porsche, and nothing like the bundles you are forced into in the US. HIDs appear to be standard, but dynamic lighting is not, nor are fog lights. There's a bunch of safety options which I think are all standard on the US model.
I spec'd one up as close to mine as possible (2-door S w/PP and LP) plus added all of the things that come standard on the US models (fog lights, voice control, cruise control, app connect, etc), and it came to over 34k Euros, or nearly $37k. Anyone know if that includes tax? For that kind of price premium, I'm happy to have the limited options here.