EvaLi I would creat a box to store my mSD Cards and USB Sticks. After that a box for all the tiny pieces that are related with the kids playmobil, Lego and stuff, despite I know they only would use it for a week until the store other stuff into it and all these little swords will punch my feet again.
I would also think about a mouse bungee or some other stuff for my roccat Sova.