I brew quite a bit of test batches, here's what I've done so far this year:
1 gal: Spontaneous innoculated mead test
1 gal: French Toast
1 gal: Blackcurrant
1 gal: Buckwheat traditional
5 gal: Mango + black pepper
1 gal: Apricot
1 gal: Cherry + pasilla peppers
1 gal: Triple berry blend...