You should try Christopher Schlegel's lesson on "Take me out to the Ballgame". Its mostly the C major scale in the open position with a couple of extra notes thrown in. I know it a long time 'til Christmas but if you play that same C major scale in the descending direction and think of the "Joy to the World" rhythm, thats pretty easy too. The rest is not quite as easy but I think most of it can be found in those scale notes.

I also found "Ode to Joy" entertaining and do-able as a beginner.