Some more recent cover designs:
I designed the cover for the second edition of this textbook (shown on the left) back when I worked in-house at CUP, so it was really nice to have the opportunity to update it to the third edition. The grumpy gorilla on edition 2 was very popular, so it was always going to be a challenge to match up to him, but I think cuteness has won out, and I like the simplicity of this image. He has a mischievous look in his eyes.
Another textbook cover:
And a random selection of some other titles:
Zoe Naylor design & illustration 