[throwaway27448]

Haiku will always be my favorite UX just for the ability to universally modify gui modifier keys distinct from changing the actual key mappings. Ie you can choose whether to use control or command as the main modifier—very slick, makes linux and windows feel like some creaky eighties remnant.

[tracker1]

I used to use a shell replacement in the Win2K era that I could do very similar.. I don't even recall what it was called, but you could completely customize pretty much everything. On win2k in particular (vs 9x/me) you could use transparency with the images in the UI/UX. It was pretty nice at the time... When Win7 came out, I liked the taskbar/menu there more and just went stock.