Clair de Lune by Debussy
La Campanella by Liszt
Liebstraume by Liszt
Cristofori's Dream by David Lanz
Fur Elise by Beethoven
Piano Concerto in B flat Minor by Tchaikovsky (obviously without the orchestra...and yes, I've seen it done on just piano)
You could also throw in something by Chopin, too!
I obviously have lots of work to do! All I can say is (and my mom would be proud) that I wish I didn't waste time during my piano lessons!