Here's a full set of 21 'Spear of Destiny Add-on Levels'. They were made by Sam. All the levels are elaborately designed and well decorated. Some of the levels are rather interesting such as Floor 2, Floor 8 and Floor 19, and some are quite excellent such as Floor 13, Floor 20 and Floor 21. Available here. Needs the full Spear of Destiny game to play.
There's a video available of four dungeon levels (7 thru 10) at YouTube.