Randquilt is a project mainly written in Objective-C, it's free.
hack to generate random quilt patch colors
randquilt is a hack to generate random quilt patch colors, necessitated by @amandahofman's latest project.
it lays out an R-by-C grid of multicolored hexagonal patches. each patch is made of concentric hexagons, and patch colors respect the following constraints:
randquilt.html will randomly sample colors subject to these constraints and produce a image and text representation of the quilt.
a live version is available at: http://jakehofman.com/randquilt/