Just checking in and (once again) Bonehead seems to have said it for me.
But if people want a Master Gardener badge...
What about a simple letter 'M' inside a green circle (or a blue circle) for the Master Gardeners? Why 50 badges? Let them pay acorns for the state badge and for the Master Gardener badge.
And for the rest of us ignorant, uneducated types, MG still means either 'morning glory' and/or a rather small sports car preferable in British racing green.
And again for those of us who were too busy working to get a formal education, what about a 'graduate of the school of hard knocks' badge? Just saying...