1. A method of graphics processing, comprising: selecting, on a frame-by-frame basis for a sequence of frames, a selection of a set of tiles in which the tiles are sparsely sampled at an average sample rate of less than one sample per pixel; selecting, in each frame, a sampling pattern for each sparsely sampled tile selected from a set of different sampling patterns having the same average sampling rate; and varying the sampling pattern in individual tiles over a sequence of frames to temporally color average sampling artifacts.