I personally like this:
https://upload.wikimedia.org/wikipedia/en/e/e7/Haiku-small-logo.png
Small, and crisp. Looks good as a laptop sticker too. Along with
http://www.pulkomandy.tk/drop/sticker_new3.png, please do print the
small logo ones too, I'd like to stick the small one near my touchpad.
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Anirudh