if you like designing dungeons, why not try to find a RP server to do it for?
Oh trust me, I do for the server my friends and I play on. We play natural, though, so they're nothing grandiose or worth showing off. Trust me, I recognize this isn't the most likely idea to take off, but I figured it's worth a shot.
I mostly want to build a reputation as a skilled Minecrafter in advance of completing my mod. That's going to be actually worthwhile and an idea worth pursuing. This is just a shot in a dark and a foot in the door.