An Ikea Hack custom train and activity table with TONS of storage. This is such an an EASY DIY project and a great way to get all of those toys up off the floor and organized once and for all! Maybe a Lego table and storage?
Built-in banquet. We used extra thick foam (high density foam at 3 inches) for a comfy seat and back rest. I made the bench look built-in by using the same baseboard and wainscoting motif as the rest of the house
DIY cabinet [IKEA hack]
DIY Mid Century Style Cabinet IKEA Hack by Arty Home