This is an alternation of the x360 theme that comes with CPU_Meter Screenlet. I have changed it from green to orange.
I am using screenlets-0.0.10 installed on Ubuntu 7.10.
First install CPU_Meter from here:
Then download the theme and unzip the file into ~/.screenlets/CPU_Meter/themes (this might deffer based on the version and distribution you're using and where you installed the screenlet).