Everyone wants pets, and all that. And since slimes are the most awesomest mobs (they grow and are supercute, what more could you want?) why not make craftable slimes?
They already use a simple texture, so texturing them in to a holdable block is easy.
Pretend is a slime ball
You have crafted your very own small slime! Just place him somewhere and he will act like a normal slime! He will grow and such as normal.
And yes, he will attack you, because he is a wild creature and you can't expect them to be tamed so easily.
Enjoy using them as guard dogs, and using them in traps in SMP (especially once health and pvp is out, and you have to actually defend your house from griefers. Dropping a griefer in to a pit full of slimes is probably the most satisfying feeling possible).