The wooden curtain rings are from the hardware store--they are "finished"/painted (I found white, dark brown and light brown) and they have hardware screwed into them but it’s easy to remove. Metal curtain rings might also work, if you can remove the hardware and find them in a big enough size.
An easy (and cheaper) substitute would be shower curtain rings if you’d rather use plastic, and they come in a variety of colors. However they are designed to pop open, which may lead to pinched fingers, and they're kind of goofy shaped.
1-3/8" wood clip rings; Measure approx. 2" inner and 2-3/4" outer diameters.
3/8" poly satin ribbon: (3) 18-ft. spools per pair of rings for triple-colored ring sets.
a lighter, or matches and a candle
craft, fabric, or tacky glue (optional)