There are five image sheets available (PDF Files) for direct printing on to iron-on transfer sheets - reading dragons in various sizes in colour and black/white logos as shown below.

Most inkjet printer manufacturers have their own transfer sheets. Also, Staples have there own brand which works fine (and is a little less expensive). Some manufacturers have different sheets for colour and b/w. Read the manufacturer's instructions carefully as you will find that the procees differs depending on the type.