I am happy with how they turned out. I needed some file boxes like this so I could keep track of certain paper work. I didn't worry about the inside of the box since they wont be seen once there is paper in there.
They started off like this:
With the washing powder box I just cut the top off as I wanted that box to keep it's shape.
Next I just glued craft paper to the boxes in the colours I wanted. Each box is slightly different as they all have different purposes. I am yet to label them, but one was going to be bills to be paid, another business receipts, the washing powder box is for coupons and discounts and the last box is for things that need filing.
It was super easy to repurpose these boxes into something I needed and much cheaper than buying some filing boxes.