Although these projects can be a little time consuming for those who obsess over every detail of a project, it is still super easy and unbeatably cheap!
High Temperature Glue Gun or a strong glue epoxy
River Rocks (found at the Dollar Store)
Shelf Liner in a matching color (about $3 at Wal-mart!)
Cut the shelf liner. You can make any size or shape you want. Although I knew I wanted a circle, I still started with a nice big rectangle.
Before gluing, place the rocks on the mat trying to find rocks that form a somewhat close fit. It doesn't have to be perfect. If you want to use contrasting rock colors to add a design, initials or a pattern, begin there.
Once you are satisfied with your pattern, glue it down one rock at a time. (Please note that it you are using sheet liner only, the adhesive will run through, so be sure to protect your work surface.) Don't be surprised if your pattern or letter slowly shifts due to gluing the rocks in a slightly different location than before. No big deal.
When your pattern is secured move on to the background. It will be tempting to go straight to glue here, but give it a dry run first, then glue it. Once you have finished the mat, trim any excess sheet liner and... Voila!
This great idea found at Entirely Smitten.