DIY Ladder Shelves Tutorial from A Pair & A Spare. The pine planks (get them cut by the hardware store) are attached to the ladder with simple L brackets. Below is a photo of the DIY ladder shelves styled for a living room.
DIY Dollhouse Skeleton Furniture Tutorial from Greenleaf Dollhouses. For DIY miniatures of all kinds go here.
DIY Concrete LEGO Table Tutorial from Homemade Modern. You can buy LEGOs on Ebay really cheaply.