There's absolutely stacks of of variants, tile add0ons and new rules on the internet for free down load. If only there way time enough t make them all up!! However, has anyone here come across 'Pirates & Plunder'? This one's different as you don't need Carcassonne in the first place - It's a free downloadable print and play game, supplied in pdf format, and looks really good. The boardGame Geek link is:
http://boardgamegeek.com/game/13960Worth a look...
.....There is another free print and play game on the way........ but I've not finished it yet!!
(end of Summer, maybe)