The photo above is of a fused dichroic glass pendant. It was made by laying various bits of glass in layers, then slumping or fusing them together in a kiln. As you can see, the results are often very colorful.
If you are interested in fused glass, there are many glass studios that offer classes on glass slumping. That way you can see if the hobby is for you without having to invest in a kiln and other potentially expensive equipment.