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I'd post better ones but sadly my hard drive crashed and i lost most of my sprites. Even the crappy ones I made just for the purpose of making things. But...heres the one i still have, no idea why i backed only it up...dented aluminum bar:
its basically my first ever sprite, so its pretty bad. Favorite because i have no other choices. I am making sprite for Wheatley and the other cores at the end of Portal 2 and Virgil (Portal Stories: Mel). Mostly for the purpose of making them. Laugh at it if you want.
I don't have one specific "favorite" sprite, rather, my favorite sprites are the Termineater's parts.
You can mix and match them, making different combinations. They also go pretty well with the Destroyer sprites I made.