Last year I made a lighted Fall/Thanksgiving rag-a-muffin garland that looked like this (image below) and is linked to the full tutorial here:
Cut some fabric into about 1″ strips. I didn't measure, just kind of eyeballed it. You can either run your scissors down the fabric or rip the strips. They do not need to be even and the frayed look is what we're going after. I then cut these strips in half.