Create a lithopane of any square image! Made this for use in http://www.thingiverse.com/thing:238435.
Print at smallest possible layer thickness and 100% infill for best quality. Make sure to invert the image during customization.
Modified the original (http://www.thingiverse.com/thing:78719) to increase image resolution to max possible 150x150, and patch the customizer script to respect length/width/height dimensions.
Updated Dec 14, 2014, fixed compliance with overall dimensions parameter