Flipside lets you customize your sets by adding your own props. Here's how:

Step 1. Press the menu button on either controller and choose Props from the main menu.

Step 2. Go to All Props and choose from any category.

Step 3. Choose any prop in the list and click on it to add it to your set. It should pop up in front of you once it finishes loading.

Next: How to grab and interact with props