Penrose Tile generator

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.

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

I found this java software that exports as PNG. You cannot tile it, just use an image.

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.