Some excellent screen components are starting to get published as Salesforce Labs packages on the new Flow Solutions section of AppExchange. These require no code at all.
Swipey is essentially a Multi-Select Picklist control with a fun, visual swipe-left, swipe-right usage model:
Flow Magic provides a way to create picklists that use images and icons. It’s a Visual Picker builder:
Service Agent Script provides a high-visibility talking script component:
