It's easy to do, you just need a glue gun to put a bit of glue all along the four borders of the box, and then wrap the fabric around it. Then you can cut the excess of fabric, or fold it under the box and glue it to cover it entirely.
Et voilà !
|I used the exterior part from the box of an apple charger|
|I folded the excess of fabric under the bottom of the box, so it covers the hole|
|There it is ! Now i can tidy every paper or letter I don't know where to put on my desk :)|