06. Funky backgrounds
Want to change the default grey background to something more funky? Shift–click over the background area with the Paint Bucket tool to fill it with your foreground colour. Right-click it to go back to grey.
07. 1000 History states
Go to Edit>Preferences>Performance to change the number of History states up to a maximum of 1000. Beware though of the effect that this has on performance.
08. Colour Code Layers
Use colour coding to organise your Layers Panel. Right-click over a layer’s eye icon to quickly access 8 colour code choices.
09. Close all images
To close all of your documents at the same time, Shift-click any image window’s close icon.
10. Spring-loaded Move
While using any tool, hold Cmd/Ctrl to temporarily switch to the Move tool. Release to go back to your original tool. Note that spring-loaded keyboard shortcuts work for other tool shortcuts, too.