It’s as easy as 1-2-3.
First, take lots of digital photos of architecture patterns, clouds leaves, archways, waves, bricks and rocks. The key here is to find elements of repetition. These make for interesting patterns. Make sure that you have your camera set on a high resolution setting since you may later want to zoom in to best isolate the pattern.
Second, crop, rotate and stretch the image for the desired dramatic effect.
Third, manipulate the color and add special effects in Adobe Photoshop or other photo imaging software. Monochromatic images work well as patterns. Saturating or desaturating the colors can provide some very interesting effects. Then use a filter effect in Photoshop such as base relief or the graphic pen. Have fun and experiment until you achieve the desired effect. Then add type.
Simple photos can provide great patterns. You will be surprised at what you can do with ordinary photos.