Something simple needs to change. For instance, it's a month past Easter and time to get rid of the messy, grass-filled basket. But how dare you? How very dare you? The Easter baskets must stay forever! In fact, your kids aren't even going to eat the last of their candy. They're preserving it. Forever. This is just an example. This can happen with any object at any time. Simple things. You need to slice an apple, or use the last of the grapes, or move the chairs. Change, omg, stop it!
Be sneaky. It's actually a much bigger deal as they watch you do it than it will ever be again. After they're asleep or while they're distracted with something, clear it up quick, then go about your business. Instead of the flailing, end-of-the-world, how-could-yous, you'll get a question about the baskets (or whatever it is), maybe some lip quivering and a teardrop for show, and then they'll drop it.
They don't even know how not important it is until it's no longer there. Seriously.