I have used the chalks for edging around paper pieces and cards. Gives a softer effect than using inks.
Also, if you chalk on two or three different chalks (in coord colours) with a cotton ball, then, using a ruller and eraser, rub off lines in a variety of angles, it makes a really nice background. This is a technique developed by Dawn Griffith and she has a tutorial on her website showing how to do this. Really cool! I believe it's called 'Chalk Lines'. Her website link is:
http://dawnsstampingthoughts.typepad...ping_thoughts/