I think you would need to look at employing a vbulletin skinner to do that, having themed my own board by tinkering (I know how to do html+css already) it isn't something that someone is likely to do for free
https://vborg.vbsupport.ru/showthrea...rdpress+header this post might help you a bit
shows how to get the header and footer from wordpress onto wordpress, then you would have to tweak the colours in the forum styles manager, should get you some of the way there if you don't want to pay out money