This sheet is based on Branko Vukelic's (aka foxbunny) awesome logo sheet created for the Arch Linux logo competition. http://dev.archlinux.org/~travis/logo-contest/submission-blank.png
If you want to do him a favor, attribute him whenever you use/distribute this sheet :)
I hope it will help you in creating awesome background-neutral art! ;)
You can read a bit more on this at http://fgl.tumblr.com/post/58215204/i-finished-that-logo-testing-sheet-to-be-honest