It's not that hard to be (glowing) green. You just need the gene to create this protein. Source: Wikipedia
(12/08/11) Gene sculpting is gaining cautious acceptance for purposes of medical research and treatment, but a bioluminescent rabbit created by a "transgeneic artist" for esthetic purposes is pushing the limits of the debate. Dr Curt Stager and Martha Foley discuss the implication of Alba, the glowing bunny.