Here are three labels by three different breweries that play with asymmetry as a composition element.
The first is by Schlafly, the famed St. Louis brewery.
Next up, Evolution Craft Brewing's Lot No. 3 IPA:
Lastly, MacTarnahan's Ink Blot Baltic Porter
All of these labels use limited color palettes and appear symmetrical in basic composition, but use subtle techniques to keep the art dynamic.