Simple patterns, great effect.
01. All the following patterns are achieved by opening a 5x5, 5x1, or 1x5 (pixels) document, and using the pencil tool. The patterns can be enlarged or shrunk by using smaller or larger canvases. Then go to Edit --> Define Pattern, to name and define your pattern.
02. Grid
03. Verticle Scanlines
04. Horizontal Scanlines
05. Diagonal Scanlines
06. Dots
07. Squares
08. Diamonds
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