4 ms·

With several backgrounds like that maybe you can build up a Fourier representation of a small image http://upload.wikimedia.org/wikipedia/commons/2/23/Dctjpeg.

• duskwuff 14y ago
  Right, that's what I kind of had in mind. It'd be tough to combine them to get a "checkerboard" result, though, since you can only specify them along a single axis. You might be able to do something fancy with multiple overlapping backgrounds, though.