Are you looking for a sign that has a cute saying and also incorporates what you're serving/hosting? Because that would be pretty difficult. I would just keep it simple and say "Please enjoy a Miller Lite or Barefoot Chardonnay or Merlot on us. Thank you for coming!" Though I'm not a fan of cutesy kind of signs/sayings when straightforward will work, so maybe that's just me.
I would definitely go with tpender's suggestion. This (<- clicky) is what our looked like and afterwards I heard that people didn't realize the beer and wine was complimentary. Uh, whoops.
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Re: Wording For Complimentary Drinks
@tpender -- you hit the nail on the head! That's what I really meant
Thanks!