The Call to Action Widget (CTA Widget) area is coded to allow you to upload an image as the background. This widget area displays just after the Home Middle widget areas and above the Home Bottom widget area on the homepage, and just above the footer on all interior pages.
Adding an image as the Background:
Navigate to Appearance > customize > CTA Background
Your original image should be created at 2680 x 300px for optimal viewing. Here is how you should configure it to look like our demo:
If you are uploading a pattern you could use the background repeat feature.