So I found this on Tumblr, where they have various 10-day challenges that go around. This is the 10 Day Katy Perry challenge. Basically you start with answering Question 1, then come back each day and answer the next one until you're done.
Have fun!

1. All time favorite Katy Perry song
2. Favorite album
3. Favorite song on One Of The Boys
4. Favorite song on Teenage Dream
5. Favorite non-album song
6. Favorite Katy Perry music video
7. Pick your favorite lyric and explain why you love it
8. Favorite video of a live performance
9. Favorite Katy Perry picture
10. If you could have your own private concert with Katy Perry, which 3 songs would you ask her to sing and why?