The reason i have changed it is because a lot of people didn't like the generic one we used to have even though it worked well as it scaled to any size screen.
The problem is once you move on to displaying a photo/photos you start to run into scaling problems as it will have to cope with many screen sizes and resolutions, on some screens it will look ok on others it may look dredfull.
You also have to considder how much of the background you want to show by reducing or enlarging the forum width, as a result this will also have an affect on how the forum looks and displays.
So something as simple as adding a background photo can become quite complicated to get right on lots of diffrent screen sizes and resolutions.
At the time of posting this the forum is set to 80% this means it will scale to 80% of your screen size and display the background on the rest of your screen, i could set the forum to a spcific width (say 900px) but on small screens it would go off the sides and on Hi res screens it would look tiny so sticking to a percentage is the best way to go. in my opinion.
Ok now that i have explained the problems how would you guys like me go on this, I'm open to all surgestions but keep in mind some will look better than others.
This is the curent background, all i have done is reduce some Crew 2 photos in size and stich them randomly together so they will scale to any resoloution. I'm not keen on it ether just trying to find a happy medium to a tricky problem.