When I first starting buying the minis, I was able to keep them easily filed in rainbow order in one or two of the storage tins that are made for this particular product. However, as my collection grew, so did the need to keep them more organized and more easily accessible.
I decided to split the tins into color families. My first order of business was to sort out all the minis to see how many of each color I had. I decided that as long as the color family was together, it could share a tin with another family - if they were both small enough. So pink and red share, as do yellow and orange. Purple and black/grey also share as they are both very small families.
As you can see, there are spaces left in the tins - enough that I could get rid of a whole tin, but I want the colors grouped together, so I decided a few dollars for another tin was worth it. Plus, I've got room to grow now, if Ranger ever decides to come out with more colors!
Happy Crafting (and Organizing)!