The icons are made by RamzeaG and by Tiheum (from Faenza). Thank you guys, for your great work.
Installation:
1. Decide which icon you prefer, both are nice
2. Run nautilus in sudo. ALT+F2: gksu nautilus
3. Copy one of it into: /usr/share/icons/Humanity/actions/22
4. Restart ClipIt
5. Enjoy

These icons should also work for other clipboard managers.

Ratings & Comments
1 Comment
Since release 1.4.1 http://clipit.rspwn.com/release-1-4-1/ the ClipIt icon can be found here: /usr/share/icons/hicolor/scalable/apps/clipit-trayicon.svg You need to replace the clipit-trayicon.svg above with one of the icons in the .tar.gz file. Enjoy!