Putting many small good ideas together doesn’t mean that we’d have one great idea. The decide workshop should have paved the way to create a coherent prototype, that allows us to verify our conceptual choices with the user.
How do we present those concepts? That depends on the context. It’s common to create an interactive prototype that allows the user to click through various pages. However, we are not always designing a digital product. Therefore, there is no single recipe that dictates how to create a prototype and how it should look like.