Have you heard of moss graffiti? I have had my eye on it for awhile, and would love to try it out one day. In the meantime, I am having fun with digital moss graffiti! This one's been tagged and stencilled over as well. :)
I used a larger scale here than I would to print the fabric, so that the design is more easily visible on the computer.
Here are some examples of moss graffiti:
www.environmentalgraffiti.com/featured/moss-grass-graffiti/2147
