Yeah! They could've done like a "Green Day" with Oscar or something.
I think there was something like that last year, with the green Elmo from "Being Green". But this thread seems to have kept up with every new day when it becomes that day (though most days last a week; these past two weeks have had a new day each day). Too bad they probably won't ever arrange for Kermit to host a day (Kermit would be the ideal host for a "Being Green Day" or a "Frogs Day"). I know, they recently got permission to have him cameo in Elmo's World: Frogs and to put him on a new DVD cover, but I doubt they'd try yo get permission to use him in too many new Sesame Street things (and the website has never had any celebrities hosting any days... which they shouldn't).
Today is "Senses and Abilities Day" with Super Grover 2.0.