Used Adobe Illustrator to create a vectorized file, then uploaded it into Creative Space. Sometimes, I add the text in Illustrator, but I just did it through Creative Space this time.

Position your slate and frame your work area. I personally like putting my slate coasters in a cut-out piece of basswood to help me keep measurements straight. Not a jig per se, just something to make sure I'm aligning correctly, especially when doing the square coasters. My settings can be tweaked if you'd like a lighter image or could be inverted, even.

These particular coasters accumulate quite a bit of dust, so I tend to wipe them off with a damp paper towel, let them dry, and wipe again with a dry paper towel before spraying with polycrylic spray.