Changes

It was Sir Terry Pratchett whose who chose Paul Kidby as artist for ''The Last World'' and the covers of the ''Discworld'' novels from 2002 onwards and it was a marriage made in heaven, with the one complementing the other. Kidby himself says that designing the characters with pencil and paint ''challenged and amused him beyond measure.'' The writing conjured clear imagery and it was his job to capture the humour and richly-textured stories on paper. Kidby and Pratchett shared interests in nature, folklore, science and history as well as a love of Monty Python and the bizarre - and to my eyes , at least the result was more, far more, than the sum of the parts.

In ''Terry Pratchett's Discworld Colouring Book'' Kidby has produced a selection of some of his favourite characters all redrafted as line art. I liked this approach: there's nothing worse than trying to reproduce an original picture which you love - and failing. Here you get ''original'' pictures to complete, including many of your favourite characters: Granny Weatherwax, Sam Vimes, Archchancellor Ridcully, Rincewind, Tiffany Aching and Death. There are some colour prints at the end of the book, which I wasn't expecting. Fortunately , I didn't spot them until I'd had a go, so I wasn't discouraged.

As well as the full-page and double-page spreads there are smaller projects: I idly coloured in a banana whilst listening to a disembodied voice tell me that my phone call was important to them. The paper is of better quality than I suspected at first glance - a black felt-tip pen didn't show through on the reverse no matter how hard I tried. I prefered prefer the effect of using crayons - the result was more subtle, but give your creativity free rein and see what happens.