Gene splicing is more easy than some people would think. It can be done on any bacteria, cells, and DNA though it's easiest to mess with bacteria. To make a strand of bacteria do such a complex thing as bioluminescently glow in ultraviolet light is take the bacteria and some DNA of a jellyfish, break down the cell walls and nucleus membrane with various alcoholic chemicals, apply the jellyfish DNA and a binding agent which forces the gene of bioluminescence to become dominant, and wait for weeks and you will have spliced genes! Here's some pictures of what pure bacteria look like:

And here's a picture of what unrecognizably altered bacteria look like: