I conlang now. I have a sketchbook, too, but most of it will probably never be uploaded.
What is Conlanging? It is the (art) of creating new, fictional languages, right down to the syntax and dialects. It's a lot of work, but I find it fun. J.R.R. Tolkien, author of the Lord of the Rings books, was himself a conlanger. He created several languages for the different races of Middle Earth.
Much of the art in my sketchbook is concept art for the world the speakers of these fictional languages live in.
I personally conlang for the purpose of fleshing out different races I have created. The actual use of these races and nations can be observed at gathering.forumotion.com/forum
(At the bottom, the 'Forum Wars' section. My name on that website is 'darthme')