redshift has two icons to show the status (active and idle)
For my opinion the red active-icon don´t fit in the rest of the icons in the panel from ubuntu 10.04 with ambience. So I changed the original-icons only a little bit.
To take the change effect, you need to copy the icons to /usr/share/icons/ubuntu-mono-dark/scalable/apps/.
Then only switch the lamp off an on.
What is redshift?
Redshift adjusts the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night. This program is inspired by f.lux (read here for the reason why I started this project).