Actually I had been thinking that a Blockland community greasemonkey script could be really cool. For one thing, linking the Blockland logo back to the forum index instead of the blockland homepage would probably fix one of the most annoying issues I have with the forums. Being able to set maximum/minimum font sizes, font types, and font colors would be cool and being able to block certain people's avatars would be really cool. I assume youtube videos could be embedded in the forums using a greasemonkey script. You could also skin the forums, automatically switch between night/day reading modes based on the time, put images in some kind of containers to keep things from stretching, etc.
At least, I assume you could do all that.