Our kids' stuff gets EVERYWHERE. What with arts and crafts, cookery bits, board games, play shopping, children's books, bikes, scooters, etcetera, etcetera, we were finding that the kids' things were spreading from their bedrooms to fill all the shared spaces in our home too. As a result, K-Dog and I found it more and more frustrating when WE wanted to do something; nothing was ever to hand or easy to get started on.
But the good news is that when we took a hard look at our small-to-middling Victorian terrace house, even bursting at the seams with stuff as it is, we were able to find spaces to annex as dedicated 'grown-up' areas - one for each of us. All it took was thinking about what we both needed, and then identifying a few wasted areas around the house that we could make better use of with a little bit of reorganisation. And I promise you, if messy pack-rats like us can do it, you can too!