Lay your velvet out on a cutting mat. Measure and cut a 3-inch-by-30-inch piece using a rotary cutter guided by your ruler. Make the cut in one long smooth motion so you have a nice clean edge.
Fold the strip of velvet in half lengthwise, with the right side of the fabric facing out. Crease the fold with your hands only.
Sew the long raw edges of the folded strip together with a running stitch 1/4 inch away from the edge. A running stitch is a simple back-and-forth stitch with a 1/4-inch or longer length for each stitch. Leave a tail of thread a few inches long when you finish stitching across the edge.
Pull the tail of thread to gather the velvet fabric. The fabric will begin to coil naturally as you gather it. Coil it tightly in the beginning to form the center of your rose, and gradually get looser to form the outer petals.
Wrap the last 1 to 1 1/2 inches of the velvet strip around the underside of the flower so the raw edge is neatly tucked under. Sew a few stitches through the layers of the rose on the bottom to hold the flower together.