The rod hexagonal rods used to open and close the blinds, many are made of clear plastic and can be cut down to make perfect crystals. Even opaque plastic rods can be painted to look like crystals, though both kinds of ros can be quite large for say fire warrior models. You can find old blinds at Salvation Army or junk stores, and sometimes you can find "replacement" rods at hardware and retail stores.
Otherwise I found this site on the internet; but a disclaimer here, I've never purchased their products. Green Stuff World