3-D printing is one of those things you can easily live without, but once it's in your toolkit, you just find more and more uses for it. I've never been very good with the mechanical side of projects, but this lets me use my trial-and-error based approach to manufacturing, which works really well for me.
Just showing some designs I've worked on. Most of these are utilitarian vs. artistic per se, but it still feels like a creative process to me.