What I would suggest and I recommend for new forums is that they don't have too many categories. People visit the forum and see there's not many (or none at all) posts in some sections so don't bother with it, whereas if you have less sections and more posts in the less sections you can get more users posting because they won't be 'afraid' to be the first and it will "look" as if there are more posts than there actually is. Also, I'd recommend getting a header with your forum name on it otherwise I must admit, I do quite like the colours you've found/used. Good luck with it and don't forget to advertise it - whether that be paying people forum credits to display your link in their signature or signing up to different forums and posting around a lot so your link is seen in lots of places (over and over).
it looks good.. the color combination is not bad.. the design also looks good.. just work on the membership.. try getting more traffic.. good luck!