One thing we did with our kids is take the toys that are left laying around and put them in a cardboard box, away from them. After a few weeks, when they run out of toys, we pull one of the cardboard box, and it's like Christmas for them!
Another advantage is that some toys never make it out of the cardboard box, you can donate/recycle them.
My SO's mom did this with her and her brother. They didn't have a lot of money, so it helped in that regard as well. I think we're going to try it with our son too.
Another advantage is that some toys never make it out of the cardboard box, you can donate/recycle them.