How to make a textured printable in Photoshop

I have always loved the look of weathered signs, aged furniture, and roughed up edges. Whenever I craft with paper, I always have sandpaper on hand so I can add texture around the edges and corners of my final piece. The design world of late has been all about flat design with solid colors and no texture, and that’s great for web display but I miss the tactile look that textures provide!

So I’d like to share my method for adding texture to a printable (or really any design) in Photoshop.