I've never done it, but why not try to take a piece of scrap paper, draw the layout you want, cut it apart and use the pieces as your templates? If you get a design you really like, glue the pieces to CS and use them over and over. The black strips, which appear to be like a stain glass leading, can be cut and glued on top and that would cover up any narrow holes which might occur in the initial blocking.
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