| | Re: Centers...???
Offray probably sells them in those packs. Some of the stores have fairly large ones at times.
If you want to make just take thread down the edge and pull to make ruffles. Tie it to keep the ruffles in place and knot.
Then pull around and sew thru the base of the flower as you go.
Easy as pie. And really fun once you get organized.
Offray also has instructions on different ribbon flowers on the site so i bet you could find a few variations.