I just pulled this out today. It's a UFO I've had for about 4 years now. I started this in a class so we used fat quarters and cut them.
Looking at the instruction, it might be doable to use jelly rolls but then again I don't know, I'm not good at "reinventing" the directions on patterns LOL!!! I think it'd be more tedious work using jelly rolls since the 3" strips are cut from a 10.5x20" block/strip if that makes sense.