It's no secret that I love words. I love making them up. Onomatopoeias are my favourite. I'm often making a lot of noise as I research sounds - banging my gong (that's Sensei in Samurai Kids!) and dropping rocks off my balcony (so I can hear the sound of Iluak tripping over the soapstone pots and pans in Polar Boy).

The other thing I really like to do with words is twist them into something the reader might not be expecting. There are lots of common phrases we all know well. For example if I said "White as..." I would bet my next book at least half the class would say "snow". And if I quoted an idiom like "the cat that swallowed the ..." the other half of the class would say "canary".

One way to improve your descriptions, and have some fun at the same time, is to always say the unexpected. And if possible, to relate the unexpected words you substitute, to the genre or tone of the book. For example in Samurai Kids, when I was describing a sly smile, I used "the cat that swallowed the crane". I specifically didn't want to say canary (like everyone would be expecting) and I chose crane because it was not only a Japanese bird but the spirit symbol of my main character Niya Moto.

Here are some common phrases for you to improve.

as white as snow
as dark as night
as hard as nails
as slow as a snail
as fast as bullet
as dead as a dodo
as weak as a kitten
squawking like a parrot
exploding like a bomb
crying like a baby
howling like a wolf
sparkle like diamonds
glitter like gold