Hello,
The background image for "TASTE OUR BEST PRODUCTS" is in /templates/sparky_framework/images/featured_products.jpg (1920 x 1920 px)
The background image for "AFFORDABLE BAKERY" is in /templates/sparky_framework/images/price_list.jpg (1920 x 1920 px).
You can create your background images, name them as those above, and upload the images via FTP (overwrite existing).
Also, you can select other images (or solid color, or disable images...) in the template options (under Layout > Row Settings).
Regards,
Milos