alt Hacker NewsPicture+Wikipedia entry: https://en.wikipedia.org/wiki/IRIX_Interactive_Desktop
Fun fact: Irix 5.3 in Nov 1994 was the first desktop OS to allow web URLs to be desktop shortcuts, pre-Windows95+MacOS similar capability. SGI licensed Netscape Mosaic so they could do that.
When I first switched from IRIX to Linux I missed the SGI desktop, and was running a clone. I think it was this one - looks like it is still around:
http://5dwm.org/sgi-schemes.html