Depth Perception alteration?
So I noticed this neat trick in a chat channel the other day and it allows for some pretty win screenshots.
Simple; first turn off your HUD (not required but easier for screenshots) using Ctrl + F9 (same to turn HUD back on).
Next, hold CTRL and both your mouse buttons (right and left). Then drag your mouse right to increase the perception. Drag left to return to normal. You can still zoom in and out, pan and rotate as normal but it changes your depth.