If your Christmas gift guide needs an entry in the "stuff that sounds stupid at first but then you quickly realise it's amazing" section, ThinkGeek's talking Cave Johnson portrait should do the trick.
Officially licensed by Portal creators Valve, the portrait measures 15 1/2" x 11 1/2", and comes packed with thirteen phrases (the actual ones from Johnson's wonderful voice actor JK Simmons) that can be activated either by walking past it or pressing the things' plaque.
It'll sell for USD$40 and will be available next month.
Portal 2 Cave Johnson Talking Portrait [ThinkGeek]
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