I have 54mm American War of Independence, 15mm Vietnam, 28mm Fantasy, 28mm Weird War II, 28mm Pulp, 15mm WWII (Soviets, Germans, British), and finally 15mm Sci-Fi.
On the other side though, I have a bunch of painted figures to show for my hard work. Most are pictured below, although there is more that is boxed up.
Top Shelf: 54mm American War of Independence
Next Shelf: 28mm Fantasy, 28mm Dark Ages, 15mm Sci-Fi
Next Shelf: 15mm Irish Guards, 15mm Soviets, and some Chaos Space Marines
Next Shelf: 54mm American Civil War (Union)
Next Shelf: 54mm American Civil War (Confederates)
Bottom Shelf: Mexican Revolution (1911)