From the MAKE Flickr pool:
Ryan made his own retro-pixel cookie cutters and churned out a fresh batch o’ aliens. He seems to be a little wary of eating them tho, since the cutter shapes were assembled using solder. Yeah, probably a good idea to avoid all known lead content in food – but hey, they look cool!

Space Invader Cookies on Flickr -Link

Related:

Space Invaders – worldwide art project -Link