Coming from an OpenBSD background (hey - it's the only OS in the world allowing you run Xorg as an unprivileged user [1]) -- what I'd like to see is an intra-BSD desktop environment based on Google's Material Design guidelines:
http://google.com/design/spec/material-design/introduction.h...
And for ol' times sake, the IRIX® Interactive Desktop User Interface Guidelines:
http://menehune.opt.wfu.edu/Kokua/Irix_6.5.21_doc_cd/usr/sha...
Similar to Quantum OS (Linux):
https://news.ycombinator.com/item?id=8645504
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[1] http://undeadly.org/cgi?action=article&sid=20140223112426