I agree, I would really love to see some classic skins revived for the new progression server. The UI I currently use is Default Old, and it currently works and is updated. I recommend it in the mean time, until hopefully some other classic interfaces are updated. I like to set the chat box fade to 50% to make it more transparent and feel more like it's 2001.
The interface is listed under Downloads>Featured>DrakahUI if your interested. I know exactly how you feel though.