I'm collecting my favorite Wikipedia userboxes here, some of which I made myself.

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  This user loves watching the Mandelbrot set.
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  This user has written several books in the Library of Babel.
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  This user is agnostic.
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  This user has lost sleep because of the Gödel incompleteness theorems.
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  This user believes that π repeats.
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  This userbox was added last Thursday.
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  This user is a monkey who contributes using a typewriter.
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  This user belongs to mitochondrial DNA haplogroup T2b.
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  This user really likes old computers.
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  This user wonders where everybody is.
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  This user belongs to Y chromosome DNA haplogroup R-L1029.
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  This user's favourite colour is green.
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  This user is a witness to the early days of the Internet
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  This user is a determinist.
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  This user believes that If a tree falls in a forest and no one is around to hear it, it doesn't make a sound.
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  This user is unsure whether he is still the original user.
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  This user is a Singularitarian.
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  This user thinks a lot about transhumanism.
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  This user owns a Nokia E72.
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  This user worries he might be a Boltzmann brain.
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  This user is a fan of Conway's Game of Life.
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  This user is a modular synthesizer player, user, tweaker, and builder.
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  This user is interested in Lucid Dreaming.
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  This user prefers film cameras to digital ones.
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  This user cannot prove to others that he has subjective experience.
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  This user was told the Hilbert Hotel is full.

Images used on this page are sourced from Wikimedia Commons and are used in accordance with their respective Creative Commons or public domain licenses.