In addition to Corners and Embelishments, you can also add Stickers to your project. This is a fun way to decorate and further enhance your pages.
You'll see the Editing Toolbar on the left. From there, click on the happy face icon to access Stickers.
You can then either search for stickers by keyword, or select from various categories, such as Party, School, Music, and many others. Once you've found the Sticker you'd like to add to your page, simply click on it, select whether you want to add it to the Right or Left page, then click on Apply Sticker.
You can then move or resize it however you wish. Explore the options and have fun!