Simply use the basic knot you’d use to make friendship bracelets to wrap the main cord and each of the individual earbud cords. To make them even more tangle-proof, wrap plastic coated twist ties inside with the cord.
Printing with Gelli Arts®: Gelli™ Printing with Styrofoam Plates Here’s how: Place a styrofoam plate on a cutting surface and using an X-acto knife, cut some slivers or shapes from the plate. Remove them to create a few holes or empty spaces. The plate w