Pink Tentacle does an interesting round-up of rice field art from Inakadate in Japan. They've (the farmers, not Pink Tentacle) been doing this since 1993, apparently, creating "works of crop art by growing a little purple and yellow-leafed kodaimai rice along with their local green-leafed tsugaru-roman variety.
And I can't even draw a straight line with a ruler. So color me impressed. Some of the art has text included--wouldn't it suck to have a typo in something like this?