 Tux Racer -- great game, but note that it doesn't run well on older systems.
 Super Tux (Super Mario clone)
 Icebreaker (xonix clone)
PDF Print-outs:
 Tux Origami,  Tux Buttons (or stickers)
Also
 Plus a short lesson on operating systems, Tux and open source, including direct links to Wikipedia sources.
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