Some people use washers to form perfect small circles for appliqué, but I always lose them, plus they're not always the right size. I like to cut my circle templates from Templar®, a heat-resistant template material like a heavy Mylar. Mark the circle template on the wrong side of the fabric, then cut it out, allowing room for a 1/4" turn-under allowance. Stitch a running stitch about 1/8" beyond the marked line, then pull on the thread to close the turn-under allowance around the template. Spray the fabric circle with starch, press it with an iron on cotton setting, and let it dry. Pull out the template with tweezers and draw the thread closed until the circle pops back into shape. Finally, appliqué your perfectly round cherry, or berry, or whatever it may be!