I love to browse through photography websites. Unsplash.com is a great resource for designers because the photos are free, license free, and high resolution. Plus, you will find some really unique shots. Another great site for this is morguefile.com. I had thought of the phrase, "Don't fret," as in "Don't worry," but I wanted to find a great shot of frets on a guitar. Sure enough, morguefile.com had the perfect photo! I had a lot of fun working with perspective on these letters. It took awhile, but I think it was worth it.