Lullabies...I love Golden Slumbers, too! Also, Sleepytime Skies, Beautiful Dreamer, Baby Mine (from Dumbo), You are my sunshine, and several other more non-traditional ones that I can't think of at the moment...
Kids songs...a lot of the ones from the Putumayo CD's, Teddy Bear Picnic, I'm a Little Teapot, a few of the ones from a Kindermusik CD we have, Mary had a little lamb, and several other songs we make up as we go. ;-)