Get some gallon or half gallon jugs and experiment away. You won't know how the yeast reacts with certain additives by just adding flavor to beer. With half gallon growlers you can have 10 different experiments off one 5 gallon batch.
Primary - American Wheat, Yooper's Centennial Blonde, EdWort's Apfelwein
Secondary - I don't do this anymore
Bottle Conditioning - Traditional Mead
Drinking - Pliny the Elder Clone, 60 Minute IPA, Cascade Pale Ale, Oatmeal Stout, North English Brown Mild, EdWort's Apfelwein