Tom -
A blank particle board isn't a particle.
When you select "Create a new particle object", you are presented with a "blank" space on which to work. When you go to "Add new particle object" then "Add/Delete particle", first click the add (+) button and navigate to the pre-prepared .png file.
Once it's imported, you'll be able to delete the default particle.
After you've set all the parameters, you can save your particle template.
Cheers - Tony
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