Discourse has the ability to add Category Logos and Background Images.
https://meta.discourse.org/t/category-background-images/24403/24
Background images seem pretty much useless but the Logos seem cool.
Anyone here want to whip up a logo for your favorite category? Submissions can be rotated every so often. If it works out we can add them to other categories.
max-height: 150px
max-width: 260px
Feel free to try out a background with CSS on your own Discourse and take screenshots.