I have one for MAC collections with one tab for each new collection. Each tab has a color story. I highlight what I plan to get and put a price next to it, so I can get a total $ amount of my haul. It acts as my wishlist. Then I have one as an inventory. There's a tab for each product type (lipsticks, glosses, shadows, blushes, etc.). Each tab has a column for shade name, formula, collection, perm or LE, color family, price, date of purchase, etc. This helps me when trying to figure out which products I need to use up or maybe realize I don't need another pink or red (but I just can't seem to stop buying them).