You can generate templates for Marvin JS with the help of the following form. Just fill the form and push the Add button. The template source appears in the Result text box, and the generated (24x24 )icon displays above it.
By repeating these steps, you can append further and further template to the templates object.
Finally, you can copy the textual result (from the textbox) in a file that you can refer later in Marvin JS.