Can we talk about how a single accent color can fix a whole design?

I was working on a flyer for a local bake sale and the layout felt flat, just beige and brown like the cookies. After adding a tiny bit of teal blue to the headings and borders, the whole thing popped and looked way more fun. Has anyone else had a design saved by one simple color change?

Showerthought: I thought my setup for a weird aluminum part was fine, but a tolerance call from a client in Boise had me chasing my tail for 8 hours.