If you have worked in a lab (especially University lab), then you probably have come across to space problems.
Here is one of my idea. I purchased some file boxes and put them right next to the small space of my desk. These spaces exist in other labs too (every lab is the same and that is how most research buildings are designed) but they are used for putting umbrella, small boxes, old posters or some junk.
Look around your lab, there may be spaces you can turn them into something else.