I find it relatively easy to keep my ideas fresh because I focus on the book / article / source material most when coming up with concepts (rather than falling in love with a visual approach before doing the research). As a designer, you need to figure out a process that lets you work through the good ideas and bad ideas in a rough exploratory way. I love doing verbal ideation before visual ideation—making word association lists and letting my mind wander. the more I do this in the early stages of a project the easier it is for me to come up with something unique. I think if I started with sketches first and skipped this step, I’d probably repeat myself a lot.