Scratch Paper, Pen, and SD Card Tray

I like to use used paper (8 1/2" x 11") from my document printer for scratch paper. If the paper has been printed only on one side, you can use the other side for notes, etc.

After collecting a bunch of scrap paper, I use an X-acto knife and a ruler to cut the paper evenly into 8ths (shown in the accompanying image) and place it in the tray. Since I am always jotting down notes and measurements, I find this extremely handy.

This tray also holds up to four pens or various tools, and has slots for SD cards. 

I have applied non-slip stick-on feet to keep it from slipping around on my desk.