Proteus

Hello Everyone! Please don't shoot me, but I did my homework before posting...! I need: 1- Please tell me how to change the black Background Screen, the one behind buttons, not the splash screen, to a custom one, on AVIC-F90BT. 2- Is there any was to change the color of the touchscreen buttons also? Like from default white to Red? 3- I'm driving a 2004 green VW Passat, so if you have any "VW Blue" Background Screen with possible Red buttons, that would be GREAT! Thanks a bunch in advance!