The troll responses in this thread are going to reach ridiculous levels.
I'll field this one.
1) I enjoy the colored back of the phone. It brings a splash of color to a line of products that has been dull for so long.
2) The rounded polycarbonate back of the phone is more pleasant to look at and hold as compared to the cold, industrial looking and feeling 5s.
3) I saved $100 by going with the 5c. That money allowed me to purchase Applecare+ for my phone.
4) I'm not the shallow sort of individual that cares what other people think about the phone I use. I mean, really? Grow up, people. If you think my phone is "cheap-looking" I don't really care. Whatever makes you feel superior, man.
Got there before I had a chance to.
My wife and I both bought 5Cs on launch day (she got yellow and I got blue). Paying £29 each upfront instead of over £100 makes a huge difference!