I work at a planetarium and for one of our shows, we talk about the moon. I always have to draw up a diagram on the chalkboard and one day I decided that I was going to make it prettier.
When I looked at the original drawing, the style that seemed correct was similar to an old diagram of moon phases drawn in ink on old paper.
The only things I didn't make myself are the fonts, which I got at da font [link]
I made this about memorial day weekend. Since then, I converted the fonts into objects so I don't quite remember their names (I know, I know...bad graphic designer! You should know better!) I might try looking through the fonts later...
Another thing that I didn't make myself were the splatter. I got the splatter from some brush package. I don't remember if i got it from a free site or here. Either way I picked the splatter that i liked the best and made a new image in photoshop and put a new splatter on each document. After I picked all the splatters, I brought it into Illustrator and lived traced everything.