Profile cover image help

I've posted this in the actual Mybb forum, but all it's done is made people send me quotes of $50-$150 to do the plugin!

Basically I love the profile cover image you have here on nulled. I was hoping that there is a plugin (or code) that can do this (or even better, like Nulled's where it's actually built into the main background)


I was hoping there was a plugin that did this with permissions per group? I am willing to pay as long as it's not a ridiculous price.

Thanks for any help.