Carefully cut a slit through the topmost layer along the crease, which creates a flap on each side (be sure not to cut the embroidery floss). On one side of the slit, snip off the corner at an angle (this will keep that corner from buckling when the rosette is folded together).
You will need 2 pieces of paper for a single rosette (unless you are making small ones, in which case you should cut the paper to be twice as long). Lay the 2 papers vertically on the work surface.
(If you don't have access to a printer that will accommodate this size, cut the paper to 8 1/2 by 11 inches, and tape it together.) Yatsuo Papers in light blue (B7 medium blue (B22 green (B18 and yellow (B14 and white (A1 from New York Central Art Supply Mini stapler by Bo Bunny Press, from m, paper Rosettes How-To.
Fold each piece top to bottom accordion-style at the marks to make pleats. If you want scalloped or spiky rosettes, collapse the pleats of each sheet to make a bundle, and cut each end into a U or V shape.
The proportions of an 8 1/2-by-11-inch or an 11-by-17-inch piece of paper are particularly good for these rosettes; as you adjust the size, try to keep this oblong shape in mind.
Repeat on the bottom of the bundled pleats. Fan out the pleats to form a rosette. To join the sides, slip one pleat inside the other (place the notched corner uppermost).
To recreate these rosettes, use a paper that's easy to fold and has some body. To make the rosettes like the ones hanging from the windows in this picture and shown with the stationery below, Jayme and Chris used a paper that's easy to fold and has some body.