Onesie and diaper use Portal to explain where babies come from. Via these sites.
And a few more links:
1. Chart shows popularity of various elements of fantasy novels. Swords are very popular. Unicorns are not. Via.
2. Astro Boy movie crew t-shirt.
3. Creative redesign of Spider-Man's costume.
*Previously: Portal posters.
*Buy companion cubes at eBay.