Yes! Marvel's Design tool has a library of images, icons and UI elements you can use to quickly mock-up your designs. This feature is in currently in beta but all Marvel users will have access to it.
To add a design element to your screen:
- Open your project and hit the Design button to create a new canvas > click on the purple assets icon
- Under wireframes choose iPhone / Android / Web / Apple TV / Apple Watch > either select one of the assets or enter a search term
- Click Add to add it to your design!
Once an element has been added to your screen, learn how to edit it here