Cathy Delanssay is a french illustrator who has a number of children's books. I came across her work and immediately fell in love with the colour and texture of her fantasy laden illustraions which have quite a distinctive style. If you read french you can follow her on her blog La Goutte de Rosee. Here are some examples of her work.
I love the title of her book about mothers Mieux que dix Fées -Better than ten Fairies!
You can purchase some of her work at Fiche Produit though again it will help if you speak French!
And if you're a Firefox user you can top your browser with Delanssay designs for free which is pretty kewl :-)