When visiting Poland this summer I was happy to stumble upon some interestingly illustrated books, like this one! Wędrując po niebie z Janem Heweliuszem, written by Anna Czerwińska-Rydel. The bright illustrations are made by Agata Dudek. (Who also has a blog.) The luminescent colors and the uncoated paper makes you notice the book.
More about the illustrator on Polska Ilustracja Dla Dzieci. Also a nice interview with Agata Dudek in Uppercase, issue 14.