Version 0.1 is up of my first UI:
Minimal All-Purpose UI
This is about as clean an interface as you're going to find with a lot of great usability still integrated. Target of Target and Focus Target with cast bars are integrated into the layout, tooltips are integrated into the minimap, and all 4 Quickslot bars are in use. I'll be updating this layout tonight or tomorrow with some changes, as well as adding screenshots with companion layouts shown.
Check it out!
Kylezo
edit: v 0.3 up. See change log for update list.