Had a pink smiley quite a few months back and it was AWESOME.
Really wasted, but at the same time I danced all night. It has real highs of mega energy, and then a real wasted floatyness which went VERY well with DJ Nervous' awesome music at Sublime....
I didn't find it anything like the Bart Simpson (I didn't like those much).
Haven't see blue smilies before, but if they are similiar to the pink ones, then I say give em a go!