We’re lucky enough to have a glass kiln at the art ed. studio, so we made tacked, slumped and fused glass. You can only do up to three layers at once, but other than that there are few limitations. We scored and cut glass and crazy-glued the pieces onto the layers. Tack bonding maintains more of the design than full fused bonding, which melts the layers together much more. Slump fusing is at a lower temperature than full fusing, and you do that after you full fuse with a flat piece. Safety glasses are needed and if cutting glass with little kids, placing the pieces in a bag while snipping them is ideal so no one gets hurt.
The full fused example below contains confetti, which for glass means that the layers of paper thin glass can be placed in between the thicker ones for a see-through effect.