Here's a perl one-liner for all you gkrellm fans out there:
curl 'http://www.muhri.net/gkrellm/nav.php3?node=gkrellmall&sort=name' | perl -ne 'print join"\n",m{href=(/gkrellm/.+?gz)}g' | perl -ne 'qx(wget http://www.muhri.net/$_); sleep 2'
This will download all the gkrellm2 themes at http://www.muhri.net/ . Enjoy.
PS: I intentionally didn't enclose the one-liner in a <code> block, because the line wrapping would've inserted "+"s into the string. This would've made it a pain to cut and paste into your shell.