The timing isn't great for me to show anything, but I'm working on a UI framework that is exclusively vector graphics based. A few of the interesting things that I've come up with so far are: screenshots can be exported as SVG files rather than bitmaps; a lightweight remote graphics protocol is possible thanks to the desktop being described as a scene graph; apps can easily scale to any DPI/resolution; new and interesting widgets and app designs are possible - pie menus and the like.
Unfortunately the GitHub build is currently broken and I'm probably 2 months away from sharing anything here. I'll post something when it's more presentable.