At last, I've stumbled across a high-quality DK yarn with comes in loads of bright colours! Normally if I want bright colours I have to use 100% acrylic yarns, which are nice and cheap - great for making toys but not nice enough to use for clothing.
Biggan yarns come in 64 (!) colours and are a machine-washable 100% merino wool which is soft enough to wear against the skin. Biggan Design was founded by Swedish designer Biggan Dups. It's based in Australia, but you can buy Biggan yarn in the UK via Woolaballoo, for about £5 per 50g. I am sooo tempted to order two dozen different colours and crochet myself a beautiful shawl!
* SONG OF THE DAY: Terry Hall & Damon Albarn - Chasing A Rainbow *