Yes, I know, that post title was all too easy.
Antique painted firkins, or sugar buckets, look fantastic when displayed in a stack, as ebay seller Black Tavern Primitives demonstrates:
Firkins with their original paint are few and far between, and even rarer to find at a modest price point. But this gorgeous blue firkin from Market Square Antiques does very nicely:
And this to-die-for firkin from Doll's Plus is painted just the shade of colonial gray to blend with any primitive decor: