Here is the version I used on a paid account. It's a no-frills/default/no-style version of Flexible Squares from LJ. I'll admit, it's been a long time since I've messed with this code, but I just tried the version of the layer I have on the journal I was using, and it worked.
Hope this helps?
(Note: This is basically just a retooled version of the FS public layer from LJ; none of the actual coding beyond the "make it work" adjustments to make it function on IJ are mine, all credit to SixApart, blah blah legal jargon so I'm not breaking any sort of Creative Commons/Open Source bylaw.)