For the past 2 months [actually three days shy] MATE has been my go-to OS. I tested is a separate partition on 2 different machines. On my old Dell laptop Ubuntu 14.04 LTS has been replaced by UM 16.04 LTS; on my HP desktop I’m still using UM in a test partition, I plan on replacing Ubuntu 14.04 LTS with UM 16 once 16.04.1 is released.
As with any UI change there’s some adjustment pain; since I was accustomed to gnome flashback on 14 the pains were extremely minimal.
It was off some old Windows Clip art program. Turned out it said they were free for Personal use, but not for public use. Missed that part. Oh Well. Next time I’ll learn to read gooder!