Here's some 'Coxeter graph paper' which you may find useful. Basically, it's just a picture of alcoves for the affine Coxeter groups of type A2, B2 and G2. I've also provided paper tiled by regular hexagons, which is sometimes a useful thing to have.
For all of these except G2, there's a version in which the walls of the alcoves are labelled with the integers 0, 1, 2 in a way which will be familiar to experts.
Each file is an A4 PDF, with four pages (giving the pattern in four different sizes).
Please let me know if you find this useful, or if you can think of anything I could add.