I think the colors selected should blend with the header design. If you look at the picture in the header,

I think there needs to be a blend, or similar color scheme similar to the main page (non forum).
As the background image appears to be slightly blurred, may be due to the image dowsizing. Looking at the Outdoor picutre folder, looks like there is some great talent with the current members. If the header image is only temporary I say we have a contest to see who can make the best header... at that point the board can vote on the header image and use what best encompasses the vision of the site. If there is a change in color scheme, headers can be selected/created to reflect the color scheme.
Just my 2 cents... I like it either way!
