Sisel type material but any material could be used to cover a jam jar. I think gingham or polka dots would look great too. A lovely bright ribbon has been tied around it and a fresh cut lime has been placed at the bottom for decoration. ..Very pretty.
If anything is going to help me (finally!) keep track of my keys, wallet, and sunglasses, I have a feeling this cubist organizer is it. Store-bought unfinished wood boxes make this shelving unit remarkably inexpensive and easy to assemble. Out-the-Door Box Storage, from I Spy DIY.