The broken glass wraps have either a white or black backing (from Delmar). The black backing gives the over all color a darker tone. When I was looking at re-wrapping a kit in Green Glass Glitter, Sam sent me samples of the GGG wrap w/ the 2 diff't backings. What he calls the "dark" GGG has the black backing and is exactly the same as DW's. I ended up ordering a new kit from DW in GGG and and the wrap matches Sam's dark GGG.
They sent me a broken glass finish and it didn't look that great (well, not as good as the DW wrap); however, I think it may have had the light backing one. Do you have pics of your kit wrapped with dark GGG? Also, do you mind PM'ing me the cost and the amount of pieces you wrapped? Thanks!