Creating lettering that has a 'chalkboard' look to it is actually quite simple!
I've put together an easy tutorial for anyone that is interested in learning how to create something like this! Here's how it goes...
MATERIALS: Pencil, Paper, Scanner (or camera), Adobe Photoshop
STEP ONE: create your artwork with just pencil and paper, I usually use something semi-transparent like Strathmore Layout Bond because you can keep going over your rough sketches to create a more polished final image.
STEP TWO: Scan or photograph your artwork. If you're scanning, be sure to set the resolution at at least 300 dpi, I set mine even higher to capture any interesting smudges or marks left by the pencil.
STEP THREE: Use the levels tool in photoshop to adjust your image so the line weight is clearly visible.