Just goofing around today and make these depth maps for 3D engraving. One is a 2x2 twill (herringbone) weave and the other is a satin weave pattern.
These should tile pretty well.
I made these in Inkscape by the way. If anyone wants the SVG files I can add them, but these were vectors that were converted into bitmaps within Inkscape then cropped to make the tile.