There are a lot of dingbats that would work great for this. I used DecoDividers, letter S for this tute. Download DecoDividers dingbat at the bottom of this page if you would like to use it. Open a 400x400 canvas with a transparent background. This will give you plenty of room to work.
Flood fill with a dark color and add a layer.
Click on the text tool and choose which dingbat you want to use. The size will be determined somewhat by the choice of dingbat you choose. I used size 36 for this tute. Antialias and floating checked. Place it on your canvas toward the upper left corner.