I have a clicky technical pencil and stack of paper that I use everyday. My desk is surrounded by other materials and equipment that make it look like I'm a serious designer but that unfortunately isn't the case
I have a white board and marker (of course) drilled into the top of my door; for notes, brainstorms, and rough sketches and ideas that pop into my mind at stupid o'clock (AM) in the early hours of the morning.
Apart from that my main tools are loads of random pieces of A4 paper and a pen (not pencil).
& my iMac of course with Wacom tablet.