More animations from this Wikimedia gallery of animations from Conway’s Game of Life!
Pulsar (period 3)
Another 3-period oscillator
This one’s also really cool, but it’s not uploading for some reason
Glider trails (Conway’s Game of Life)
Image 1: A 3D-printed version based on this thing that you can download and print! (image by Berend)
Image 2: Source: http://en.wikipedia.org/wiki/Glider_(Conway’s_Life)
Caption: “A three-dimensional view of a glider, with previous generations visible going down the z-axis. The c/4 period is clearly visible as “stacks” of cells that remain alive for successive generations.” (cc-by-sa)