I got my blue 5c today from Verizon. My last iPhone was the 3G, and I've had a few different phones since then, so this is like a whole new experience.
I'm very pleased with the color. The blue isn't as bright and pastel-y as it looks in photos. It's actually rather subdued, and very nice, sort of in between dark and light blue. For those who are worried about such things, it doesn't look at all childish or feminine.
I'm amazed how something so flat can be so comfortable to hold. I'm sure the curved edges of the plastic have a positive effect.
IOS7 is delightful so far. I must say though, it failed the intuitiveness test, when it took a full minute to figure out how to initiate downloading the app store,, LOL.