An icon theme for The GIMP 2.x.
It uses Crystal icons where possible, and where there aren't any, either brightened defaults or my own hideous creations/hybrids.
To install: place the extracted folder in your GIMP theme directory - usually something like /usr/(local/)share/gimp/2.x/themes.
To use: select Crystal under the Interface section of Preferences.
p.s.: I am using Nuvola system icons, which is why there are some in my screenshot. YMMV.
p.p.s.: Incomplete. Feel free to contribute!