GKrellM Gorilla Theme
This gorilla theme perfectly fits my Debian Gnome desktop. I did not find out how swallow-applet can move GKrellM 2 in panel. So I used a trick.
I created right-side panel and then moved gkrellm(started with -wm) above it. This solution has adventage that maximized window will not hide gkrellm.
Thanks to sawfish I am able to catch gkrellm window on startup (matched window setup) and move it at the right position and setup desired state.