Once you can confidently makes blocks that are made up of squares (e.g., 9-patch, Patience Corner), rectangles ((e.g., Log Cabin, Rail Fence), triangles (e.g., Dutchman's Puzzle, Birds in Air), and curves (e.g., Drunkard's Path, Orange Peel), there is no limit to the blocks you can make. It's simply combining shapes, one piece at a time.