I have always loved the default UI, but have always felt like it was a bit unfinished. I therefore bring you Default UI Enhanced!
This is still in beta so there might be bugs.
And install it using AoC UI Installer:
Remember to backup you current UI!
A few Pictures:
Map with slimmer borders
Questlist and Questinfo
Emotewindow (compact and extended)
These are just a small selection of pictures there allot more changed.