The Shape Tool lets you make geometric shapes with your active block. Since these shapes are computed mathematically, they can adjust to any angle and transformation, giving you lots of control over their look. When you 'place' these objects, you can use the gizmo to reposition them and rotate them at any angle.
Each shape lets you tweak its XZ or XYZ dimensions. In addition to controlling rotation using the gizmo, you can also alter the angle sliders for yaw, pitch, and roll in the 'advanced options' dropdown. Plus, there are options for making the shapes hollow, placing only the outer layer.