Hi orbetting,
Welcome to CAP 
I’ll give you a quick heads up.
Why do you think Supermarkets, Department Stores and anyone selling things online use bright colours?
Because bright colours are not depressing. Take a look around and the majority will use white, either as a background or more likely where there ad copy sits, products etc etc.
TBH while I like the design lay-out of onlineroulettebetting.com, the colour choices are dull, lifeless and depressing. Don’t mean to crap on your parade but only trying to give you some valid advice.
The blue navigation links on the grey background, with the lighter blue mouse over is hard on the eyes.
Here a couple of example from two of my sites. While they target a different niche, http://www.casinoslots.co.nz and Online Pokies – Casino Pokie Guide they’re both bright and fun. Fact is, you have about 5 sec max to encourage a site visitor to stay. No matter how good the site is or how much great content, offers etc etc you have, if a punter feels uncomfortable, they’ll hit the back button.
Spend some time research colour psychology, it really does make a HUGE difference.
Cheers
Dave