My primary computer is a laptop, and I really like the trackpad. I only use a mouse when gaming, but I have very limited desk space so the mouse was always in the way. This is just a simple print that I attached to the back of my external monitor to hold my mouse out of the way when I don't need it.
Note: the small tab sticking up on the back wasn't in the original, but I found that the mouse would be falsely triggered without it so my cursor would jump around. Adding the tab to cover the mouse's optical sensor fixed the problem.
Foam core tape to mount on the back of my external monitor.
FreeCAD for the win. Source file is included for those who'd like to customize it for their own rodent.