I wanted to have a big TV set, but weird looking. I made the screen with the Pen Tool, them some dials underneath and at the bottom I added something like a strange computer interface.
Next, I outlined the TV set with a simple rectangle and used the Direct Selection Tool to drag the corners. I specifically did not want all straight lines.
It looked fine, but I decided to simulate some 3D, so I made two more rectangles and skewed them accordingly to give the TV set a basic feel of perspective. Perspective in cartoons is not always accurate, so I knew I wouldn't have a problem with that.
Next, I wanted to do a giant control board for the spaceship. Again, I used the Pen Tool to make a shape for the top surface of the board. I cut the left corner so that the board fit next to the TV set. I needed some rectangles to do the front and side of the board and some for the lower parts.