Chocolate covered frozen bananas, banana-shaped candies (runts has them), banana chips, banana smoothies, banana bread, and even banana cupcakes. You can also get creative with party games. Pin the tail on the monkey?
Real Parties: Curious Charley's Monkey Party // Hostess with the Mostess®
Curious Charley Monkey Party! - Kara's Party Ideas - The Place for All Things…
This is so cute and because a balloon is basically just an oval, it creates a lot of options for affordable treats, decor, etc. Not specifically winter-themed but a great indoor idea!