The ring is a Tomoko Fuse's design. The name of the model is "Ring 2", and is available in her book Origami Rings & Wreaths.
I folded the ring with 8 squares of 12" (300 mm) Strathmore Colored Art Paper. The diameter of the wreath is approximately 16 ¼" (413 mm), a nice size for hanging it on the door.
As decorations, I used the models that I described in my two previous posts. You can find more details about them by clicking here (flower) and here (ghosts).