Went through the Woltlab plugin store and found some themes I think look good. They’re all free btw.
Basic Core - Dark Edition - WoltLab®
Optimized WoltLab Suite design with unique features and setting options. Responsive, freely adaptable and configurable!
www.woltlab.com
Steam-Art - WoltLab®
This style is closely related to the gaming platform Steam and is ideal for clan sites that use their website with the WSC.
www.woltlab.com
I think some of them let you upload an image to be used as like a background or banner thing so a TF specific image, maybe with like a Minecraft landscape and the TF logo, could work well with that.