There are quite a few colors that are not used for any usergroup, like:
- Brown
- Rainbow
- White
I think if we had more color options than maybe there will be more of a reason for people to buy VIP, or more people will buy VIP. Maybe we could also make up different colors to use or have different shades of a color for VIP users to use. These are the only colors I can think of that are not being used for any user groups.