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Does anyone know if there's a client or web app that generates Penrose patterns which can then be converted to a tileable rectangular background image for web site?

I found this http://stephencollins.net/penrose but I can't seem to get a rectangular shape out of it for web use. Thanks.

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I believe, since Penrose tilings are aperiodic (lacking translational symmetry), there isn't such a rectangular shape.

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    Being able to fill a rectangular region is different from creating a *tileable* rectangle (a rectangle for which opposite edges can be glued together to continue the pattern seamlessly).2015-07-22
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I found this java software that exports as PNG. You cannot tile it, just use an image.

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Only dragging up an old post because there's still something more to do -- if you want a penrose tiling as a background, I built one a while ago that will generate an image for your purpose:

https://github.com/etisab/penrosetiler

Of course the tiles don't fit perfectly into a rectangle (they are clipped at the edges), it should work just fine as a pretty background image.

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here is a shadertoy program for 5 axis quasi symmetry pics, it's not as tileable as a tile version.

I just wrote a program to investigate 5 fold symmetry in 2d, it generates something akin to penrose tiling. here is a pic enter image description here and a video on YT:

i am not convinced that it can't practically be tiled in a square shape, you may have places where only one triangle is wrong in a frame of 1000 of them or something, else you could find a place with good 4 fold symmetry and blur some small places where is different on the edge.