My kids are working their way through the Markosia all ages titles. I chanced upon Raggedy Man Tales by GM Jordan because I had read his adult books. So glad I did, the pictures are black and white not color and the storytelling is great for children 6+ I would say - but my friends enjoy sharing the books as a well.
Wonderful stories for girls and boys, Viking Child is a favorite of my boys and I love the spooky story at the end - my boys took it to camp.
Markosia also have Snorp for younger readers which is really colorful but very much aimed at juniors, my boys also like Dinocorp.
Any suggestions?