Here you can see the kids use sharpies to decorate a picture.
Tip: use a baby wipe to erase if they make a mistake, but be sure to dry it completely before they write again.
On the back again, I then add these felt stickers to keep the coaster/trivet elevated slightly from the surface so not to scratch.
When all my students are finished, I lay them out on bulletin board paper and spray a clear glossy spray paint for the final coat. This helps the marker not to smear. I didn't get a picture of the spray paint bottle but will do that and update this post on Monday.