CMS Corporate Design Server fine tuning Linux ( ) linuxweb.net

quick bricks gimp

create 512x512 background layer or open reference image. fg/bg to your wishes.
Use guidelines to work presice. Make use of your chisel without dynamics.
Draw hard lines in black on a new layer.The art is to get an irregular pattern that matches on both sides.

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Create new layer, enlarge canvas to 524x524 center.

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Alpha select lineslayer. Invert selection. create new layer and shrink selection by 2.
fill new selected layer with color. disable lineslayer view. invert selection. blend out selection by 16 and press del 1 to 3 times, a bigger value would destroy the seamless borders.

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keep selection. distort selection by 16, 7,7,6 . create new layer and select it. invert selection. you can shrink it by 2. fill with color.

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gaussian blur by 9, layer mode merge. apply canvas center to 512x512 is important to have no irregulars on your image border. export for further editing. possibly bevel selections. perhaps apply bumpmap texture. try posterize your result, makes the image look like cartoon. be creative!