Custom desk organizer:

Main unit (desk caddy #1) has a spot for 4 markers, 5 Bic pens, 2 stick erasers, 1 mechanical pencil erasers holder, 2 mechanical pencils, Pentel .5 lead, .7 lead, & .9 lead 30 stick rectangular lead holders, calculator, spot for 2 sizes of post-it notes, 3 small drawers (drawers 1,2,3).

Caddy #2 I use to hold my cell phone (87mm across) with holes in bottom to route charging cord, A spot to hang your keys, I use the open spot to hold my wallet and bottle of eye glass cleaner, there is a spot to hold the small 6 inch ruler on the back of the walet area in this redesign. I do have a DUO fob holder on this unit for myself for work.

Caddy #3 is a larger drawer 4

Lastly a holder for 5 sharpies (not pictured here)

Updated Caddy and updated drawers has the following:
Calculator holder on the back (TI-30XIIS), 4 markers, 5 Bic pens, 2 stick erasers, 2 slots for 6" rulers, 1 round liquid paper correction fluid, 1 mechanical pencil erasers holder, 2 mechanical pencils, Pentel .5 lead, .7 lead, & .9 lead 30 stick rectangular lead holders, calculator, spot for 2 sizes of post-it notes, 2 protractors slots on the left side, 5 sharpie and 1 scissors holder on right side, 3 small drawers.