I have rearranged these boxes so many ways. This picture was taken about 3 years and 72 different configurations ago. I've grouped all of the blue ones together. I've made sets with only doors, or only circles like that storage bench shown here. I have split them up to make smaller sets for lots of different purposes.
This picture reminds me of the days when my youngest daughter would sit in front of her via toy boxes and grab toys. Then it wasn't long until she was pulling herself up on them. Now she climbs up them to go to sleep. Time flies, but the modular storage is still working for us.