Dissect a mouse. Take out its organs. Fix them in formalin. Embed them in parafine. Cut sections of the organs using a microtome and finally stain them. Then, enjoy watching your beautiful slide under a microscope. If you are wondering what the aforementioned procedure was about, let me tell you that it is a summary of the fun things we do for histology class. By the way, I believe these histological techniques are invaluable and are a set of skills all biology students should have under their belts. Some pictures of my slides are posted below.
Picture 1: cross sectional view of rat trachea fixed in formalin and stained with safranin-O
Picture 2: same slide as above but close up.
Picture 3: a slide of rat liver fixed in formalin and stained with PAS