ACYL (Any Color You Like) is an icon theme that can be installed under Ubuntu 11.10 Oneiric Ocelot. The theme comes with a script that allows to modify icon colors so that they fit with your current used theme. Here is some screenshots for it under Ubuntu Oneiric:
As usual, open the terminal and run these commands:
wget -O acyl.zip http://goo.gl/tLgl4
sudo tar jxvf ACYL_Icon_Theme_0.9.4.tar.bz2 -C /usr/share/icons/
Enable it now with this command:
gsettings set org.gnome.desktop.interface icon-theme 'ACYL_Icon_Theme_0.9.4'
To customize the icons, run these commands:
For more icon themes check this page.