Here is an excellent short video showing the new Clairefontaine Goldline mixed-media notebook in action! The words are in French but you can see demonstrations of different media being used including watercolors, markers, paint pen, pencils, etc. These notebooks have heavyweight 180gsm paper that is smooth on one side and textured on the other, perfect for wet and dry techniques.
The Goldline notebooks are available in the USA from Paper Bistro. The Goldline notebooks are landscape orientation and come in small (4 1/4 by 6 inches) medium (6 by 8 1/4 inches) and large (8 1/4 by 11 3/4 inches) sizes.