Overlaid

Create a procedure for your pentomino, make sure you always end up where you started and pointing in the same direction (this simple habit can save a lot of pain later!).
Now try writing a new procedure that will draw a line of these pentomineos, and then a plane of these pentominoes tessellating.
Now you can superimpose one tessellation on top of another by amending the starting point and/or orientation. Why not write a super-procedure to do this.