I've tried a lot of stuff for mood boards over the years, and honestly, what works depends entirely on your brain. I started out with Pinterest, which is fine if you just need to hoard images, but it gets messy real fast for a specific project. The algorithm starts feeding you random junk after a while.
These days I keep coming back to Milanote. It's built for this chaotic, nonlinear thinking. You can dump in images, text, music links, color swatches, PDF snippets, and just drag them around into little clusters. It feels less like a formal board and more like the inside of my head when a story starts clicking. The free tier is generous, too. Sometimes I'll start there and then export everything to a simple Canva board for a cleaner, shareable version if my editor wants to see it.
I still have a physical corkboard above my desk for tactile inspiration—postcards, fabric scraps, a feather from a walk. The digital tools organize, but the physical one reminds me why I wanted to write the thing in the first place.