For video games I've been playing almost nothing but Minecraft for weeks now. It's a really amazing game / toy / sandbox, beautifully done. The ease of playing it combined with the complexity of what you can do with it makes for a really engaging game. It's also horribly buggy and with comically bad graphics, although the graphics grow on you after awhile.
The video above is my first experiment with Redstone circuits, Minecraft's complex digital logic system. I like blinking lights. The video also shows off the lovely Quandary texture pack, which combined with the texture rotator gives a nice sense of changing seasons.