i'm working on my current project, ancient pop, and thought i would look to chuck in some retro to the mix!
building a library of interesting and unique backgrounds, textures and patterns is really useful for those spontaneous moments when you want to liven up an image.
surely that costs?... well actually it doesn't! there are many different websites where you can download free files, i use www.photoshoproadmap.com - you can also download custom brushes there too.