This is a project from a few years ago...I did it using the 2" dense foam, stencils and a dremel tool. I wanted to create a cornice but because we have block or brick wall I had to attach to the wood frame around my windows so decided to try a create a dimensional cornice for my bathroom window that could be support by shelf brackets attached to the wood frame. I would be easy to make any design or lettering and tape the design or use repositional adhesive sprayed on the back to hold it in place and dremel away...it's fairly quick and a fun project...I thought of building a faux mantle doing the same thing. The thicker foam has a tongue and groove feature so I took advantage of it on top. The "stone" color was sponged on using a mottling of gray and white.