Love this post. Very useful! I've been considering all sorts of acrylic shelves lately for flavors. I currently use these: http://www.amazon.com/Transparent-Cosmetic-Organizer-Lipstick-Super/dp/B01187Z8KU/ref=sr_1_7?s=home-garden&ie=UTF8&qid=1462149033&sr=1-7&keywords=acrylic+nail+polish+rack

Sorry for the long link. These are great for 10ml bottles and nothing else. Also, you can find them for less than half the price listed here ($8-something) from China based sellers on Amazon, but (predictably) they will take awhile to get to you. Quality seems to be the same as US sellers.