Google carnet de voyage and you get 38,200 images to pour over. But wait till after you read this post PULEEZE! Maybe I'll become the 38,201 image...qui sait?
I was already making my own watercolor paints so it was a natural. I work part-time at a pigment shop, but it took a while to get down to producing the first pans.
To make paint you need a binder - basically a glue that will make the dry pigment stick to your surface. The then-manager nudged me on, saying, "It's just like making pound cake - a pound of sugar, a pound of flour, a pound of butter etc and mix.."
BTW most of my hand-made sketchbooks are filled with Tuscan landscapes - an obsession at that time. I worked really small for years - 4 1/2" x 6 1/2" and smaller. Moving up to 6" x 8 1/2" was a BIG step. I even convinced Travel Roads to give me a 3-week artist residency in Poppi (not far from Arezzo) with these little watercolors.
At home I played around with glycerine + honey + Ox Gall...yes you can almost eat your paints, BUT DON'T! Ralph Mayer say's in a pinch you can use GUM DROPS if you have no glycerine around. Finally I got it right and began to "cook up" pans and pans of lovely, rich, granular paint and it's been nonstop ever since.
Back to making paint - I took myself off to London to an instructor from the Prince Charles' Drawing School and we spent a morning testing different formulas and making test pans. 5 days later the pans were still wet = NOT GOOD.
The French (see this IS a French-related post after all) have been way ahead of us in the travel sketchbook arena, publishing piles of facsimile carnet de voyage books. I was going to do a MACARON post today, but I was not happy with my mac watercolor, so it will just have to wait. Hang in there you macaron fans !