Honey Tree Stationary produce gorgeous glossy personalised cards for when you want to make an impression. You choose your image (from a selection) and text for the front, and they'll do the rest. They cost £20 for a pack of ten from honeytreepublishing.com, and come packaged in a luxurious ribbon-tied box.
This card from Caroline Gardiner is a perfect everyday notecard to have to write 'thank you' messages in. It's available for £2.50 from carolinegardner.com.
These super-chic Christian Lacroix Riviera notecards are every fashion-lover's dream. They come with fancy envelopes and silver envelope seals. Get them at amara.co.uk for £14.40 (pack of 12).
Every business needs correspondence cards, and these brit-inspired pink heart ones from are great. You can have them personalised with the text that you want (and change the image)- for £37.50 for a pack of 25 from personalisedgiftsboutique.com.