Well, I think that there is a fine line between being different and creative and staying within what works. A lot of people design things that are completely different and that works well if you are promoting something that is either exactly the same (ie: popular galleries, etc) or crazy different.
I think that to really get something that you're happy with, you should really think about what colors and styles compliment you and your content.
If you'd like some help starting out, we'd be happy to help you (pro bono) at
http://www.adultdesignservice.com Our lead designer / graphic illustrator Machine Gun Kelly would be happy to give you a quick sketch of a place to start.
Give me a hit up on Monday if you'd like to take me up on this offer. ICQ: 124-249-781.
Good luck starting out man.