Gkrellm is a fantastic system monitoring application. It's written in C and is therefore much faster and less memory hungry then other related applications written in script languages (ie. Java, Python, Perl, etc..)

To download themes for gkrellm visit our download page and choose any compressed .tar.gz file you'd like. To install it you'll need to extract the contents to ~/.gkrellm2/themes and then use the gkrellm configuration screen to select it.