Once upon a time we had a green smiley. Suddenly one day without warning our green smiley turned yellow. Everybody yelled, me included: "Where's our green smiley? We want our green smiley!"
And just like magic, we suddenly had two smileys, one yellow and one green. One is called Biggrin, he's yellow.
One is called Greengrin, he's green.
The end.
(Juli, I really don't have a clue. Cute smileys, though.)