Canva backgrounds featuring red plaid, ocean waves, and red houndstooth. To use, save image to your device. Open Canva.com or the app, and choose "Invitation (Square)" > Blank, and then click on the "Uploads" icon (or camera icon in app) to upload the image from your camera roll or computer. You are ready to add text with all the details of your party. (These images work best for texting your invitations rather than printing.)