Okay. It's a US site, so I understand why US holidays are hot stuff. The basic idea is fine, and i believe this is good fun, and a great alternative to postcards.
But I find myself looking for more stuff for various personal occasions, and without building upon contemporary pop music that I don't care about.
I would like more movie inspired jokes like "Temple of Cake", more jokes with music that isn't some kind of Gangnam Style (a sleigh ride with Grieg is an all too rare example), and more "I love you"s and "Just because" with other music styles.
One great thing is they've made it easy to personalize videos with different numbers of people.