How can insert images in forum index as background

[forum4]

It's actually a lot of work to do something like that, so you're not going to get a copy and paste solution here.

First, you'd need to know graphics and be able to take your image and cut it up to fit in the bars properly. Then, you'd have to manually edit the code in each bar for each image.

Would be work. If you don't know graphics and coding, it would be something to hire out for.