I made a series (about 50 ) of semitransparent patterns
Assembling 2 or more you may create more complex shapes and add more depth
Grab from http://www.flickr.com/photos/photocomix ... 836690722/
(WARNING to get there real thing, the png with the transparency, you should click above the image "action" and then "all size" chosing ORIGINAL SIZE

They are also the base material for a collettive Game here
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