Yikes Chris - that looks even worse than my stash! I tend to forget what I have when it comes to filters and pick them up when I see them at swap-meets. Hence, multiples of the same and some odd ones too. Hot items like a Summitar green filter, a UV deep red in an Elmar 50f3.5 36mm clamp on! And, multiples of orange, yellow, red and some blue (great for making people look nice and tanned)
Of course, you never have the right size when you need it. Still looking for my set Y/O/R for my Super Angulon 21 f3.4 - I did put it away in an obviously very safe place!
The rule is - when you see filters for sale - buy them. Makes a great excuse for buying lenses that they fit.