Just gonna use Default for example:
1) i have it hidden behind the player window, but the Giant Tabs names (Group, Chat window, etc), could remove these. Make all the windows straight flat boxes (no extra junk).
2) Merge the Target and HoTT for even more room
3) Small Potion Belt
4) make the Song and Spell buffs areas vertical, names and timers displayed, small and compact.
Basically make everything Very Similar to the Player window: Name/HP/Mana/End/Rest Icon/and that goofy speaker thing..thats it. Nothing extra.
Would anybody be so kind as to make up a UI like this. VERY VERY SIMPLE and VERY VERY Minimalist. Alot of people dont post here who are using Default (who dont like it), but its the closest to a minimalist that fits we can get. If someone would theyd do us a Great Great Favor
. Also (just thinkin out loud) should be easy to maintain with patches :P