I never had Brewers Cow Ice Cream, but I have had beer ice creams from the Bent Spoon in Princeton, New Jersey. They make Apricot Nectar ice Cream using Nugget Nectar from Troegs Brewing, Dark & Stormy using Storm King beer from Victory Brewing, and a luscious one using Supplication from Russian River Brewing.
Beer floats are really popular among those who enjoy craft beer, too. You might want to try one. I wrote an article on this several years ago, and it is one of the most popular:
Beer Float Recipes - Sweet Seduction