Want the ultimate souvenir that none of your friends will have? Head to Tatty Devine in Covent Garden to customize a colorful necklace. In just a half-hour, you can design and walk out with a personalized accessory that's totally chic and unique. Start with your name or another word (say, for example, "writer"), followed by a perspex color -- from purple and pink to mirrored gold and sparkly aqua -- followed by a font type, chain color (black, gold or silver) and charm. Prices vary depending on the color (mirrored and sparkles are more), but the most it'll cost you is about 37.50 pounds. Give 'em 30 minutes to laser-cut your masterpiece, and voila! A customized necklace from local designers. Take that, TopShop!