This has been on a few different news sites already, so you may have already heard:
Scientists in Taiwan say they have bred three pigs that "glow in the dark".
There's more to this than just wierd colors- the cloners were able to change a surface protien on all the organs of the pig- inside and out, the pig is green. One potential application for this is growing artifical organs that are 'pre-doped' with a genetic protien from the future recipient, reducing or eliminating organ rejections.
Of course, there's always the practical joke side of things, too.