So many to choose...and just since I hate listing things in a, well, (boring) list manner, i'll give (pretty obvious) hints instead.
Starting at number one - A world where the throne of the god of murder is seemingly up for grabs for most people - or at least those with bits of his essence - where you can meet berserker rangers, spunky thieves reminiscent of squirrels with a permanent sugar high, bald elven sorcerers and cynical, stern druids. Not a good description but hey, I tried.
Number two - A world populated by furries with a strange sense of humor and a love of pop culture references (to distinguish this one from a lot of other similar comics - the three main characters are superheroes - one is a shapeshifter, another is good with -kinesises and the third is the brute).
Number three - A universe with homicidal droids filled to the brim with gallows-humor, mandalorians, awesome weapons and a race that seemingly carbon-copied DareDevil (yay for obscure references...)
Number four - This particular dimension (or plane or whatever) is filled with ninjas that are also wizards, and the main character is as much a ninja as the star-wars kid is a jedi. (too hard? Three words: Copy Wheel Eye)
Number five - An alternate version of Denton, Ohio, with castles, transsexuals, groupies, handymen and lobotomized meatloafs - 'nuff said
Number six - The ultimate generic fantasy setting - D&D/LoTR (which is ironic, considering tolkien inspired D&D and tolkien himself was inspired by my home country (Norway))
That's about it, there's probably more, but this is from the top of my head and I'm soon going to bed. Bye all! =)