3d models are always fun. I started learning 3D Studio Max a couple of years ago and now its hard to imagine designing without it. These models help you and your clients see exactly what the design will look like before the project even begins. This assures that everyone is on the same page and helps avoid a lot of disasters.
Here are a few images from a 3d model I made for a conceptual hotel lobby. If you need any 3d modeling work done, let me know!