This is a great place for an inexpensive yet lovely manicure. They also have plenty of colours to choose from. I got exactly the manicure I wanted and didn't pay a lot for it!
This is a fast, cheap service right in the centre of Camden. Don't expect any luxuries - the place is slightly run-down, and no fancy gear or treatment... but the staff was fairly efficient and did a decent job with my nails, all in 5 minutes for 10 pounds. Not bad at all ;)