Or, you could dust off Diablo 2 and get mods for it. A VERY active community is out there, heck, I worked on a few mods.
They do everything from new monsters, thousands of new items, new skills, new character looks, everything. Maps included.
Phrozen Keep
That place links to all the mods and gives recent news on the modding community.
I recommend Eastern Sun, Ancients: The Fury Within, or Valhalla.
Installs are usually extremely simple:
Download -> unzip -> copy+paste -> load game
Diablo 2 is the Half Life of RPG's
