Figured it's time to start a "slime sightings" thread for Origin, since we now have Publish 57. The Publish 57 design notes (http://update.uo.com/design_512.html) seem to indicate they won't be found in dungeons....
Slimes are on the move! Driven out of their dungeons by the dark forces corrupting the land, a special variety of slimes are making random appearances throughout the world for next few weeks after publish. Researchers have discovered that these specially hued slimes can dye artifacts and magically enhanced items! They tend to stay in an area for two days before moving to a new location and shifting their hue.
There are a total of 35 colors: 30 minor tokuno dyes, and 5 new hues.