Create a new design in Thred software (version 1.029 or above) and insert it into Embird Editor. Then you can edit this design, add lettering or just save it in any format supported in Embird.
Thred is a versatile and affordable digitizing program, developed by Thredworks. It can be used with Embird, or as a stand alone application. More information, demo, registration and support for Thred are available at http://www.thredworks.com.