Current favourites:
Kipper (the first one). It's just right.
Where Are You, Blue Kangaroo? Good story and vibrant illustrations. DD (19 months) likes it so much she wouldn't even let me near it at first until she'd read it a couple of times herself.
Over in the Meadow, illustrated by Louise Voce. I think this is out of print. A lovely relaxing book, which has also got DD counting (it draws you in in a way that most counting books don't).
feelinglucky, you're not the only one to feel that way about the Hungry Caterpillar illustrations, although I'd never thought of masculine as the way to describe them. Interesting - I find them too free of emotion.
I find the Spot books a bit sterile, too.
Other ones that annoy me in various ways: the Mog books (DD loves them, but Mog and the Baby squicks me out, and there are various aspects of the others that I find irritating, although the mini-Mog books are great). A Squash and a Squeeze - bits don't work, plus it bugs the hell out of me that the larder doesn't fit with the rest of the pictures of the house!).
DD has loved most of her books, but has never taken to Peepo.