With 123D Circuits.io its possible to make fancy funky PCB shapes like the following.
Step 1: Edit the Pcb Border
Select the PCB border by clicking on it. You can click on a blue handle to move it separately.
Step 2: Adding Handles
Double click on the border to add a handle.
Step 3: Give It Fancy Curves
Double click on a handle to unlock the tangent handles and control the B-Spline.