A new application of genetic engineering:
permakittens, or cats which never mature.
Everybody loves kittens. The only thing wrong with them is that they turn into cats. So we'll make genetically modified cats that never get big. I've bounced this off a couple of honest-to-goodness biologists who assured me it is 100% doable and even gave me some tips.
The author of the idea, one Dylan Stiles, has worked out the genetics of it (or claims to have; not being a biologist, I can't verify whether what he's saying is plausible). Cleverly enough, his idea includes its own copy-protection mechanisms, in that the permakittens will not produce unlicensed knockoffs. (Which would be the case if they remained actual kittens, which they're not; they do mature, whilst remaining
grotesquely stunted tiny and adorable.)