Abstract: A method for making a decorative glass block bearing a design. A preferred embodiment of the method comprises the steps of: (a) presenting a prior art hollow glass block comprising a generally rectangular body having an optically transparent front surface, an optically transparent rear surface disposed parallel to the front surface wherein the front surface is identical to the rear surface, and rectangular sides disposed between and supporting the front and rear surfaces; then (b) cutting the rectangular sides to separate the prior art hollow glass block into two disconnected semiblocks, each of the two semiblocks being a mirror image of the other; then (c) inserting a transluscent sheet bearing a design between the cut edges of the two semiblocks and adhering the sheet to the two semiblocks by adhesive means, the translucent sheet being sandwiched therebetween. The adhesive joint is not visible through the front surface.