Draw to convey your thoughts. CAD and sketchup can come later. My goal for a while has been to be more organic in my thinking - this produces better efforts and a more thoughful execution, in my opinion.
Sometimes we are too dependent on computers and technology to do the drawings for us, that simple things like sketches and drawings sometimes feel like a lost art.
I found these two-year old quick concept sketches while cleaning out my hard drive, for a quick pitch to a new start-up retail company. Even though we didn't get the job, I'm still secretly wishing I could design and build this somewhere.