I'm so bad when I'm working on a project, that my granddaughter has told everyone that her mom-mom is a VERY messy sewer. I've told my G-kids that they are not allowed in there unless I'm with them since there might be pins or needles on the floor. One day, I heard her upstairs screeching and ran to see what was up. She was spread eagle across the door to my sewing room, barring the way to her brother, all the while screaming "No you can't go in there. It's dangerous!"
But I do clean everything up in between projects. At least that way, it never gets truly awful.