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Yes, there are always ways to add sections to any theme with custom coding. That’s a bit too vague of a topic to cover in detail here though.

If you’re not familiar with coding, you might want to experiment with different page building solutions for WordPress.

Many are free and available right here on www.remarpro.com. For example, Make (this would require switching themes), Beaver Builder, and Page Builder by SiteOrigins.

These may not help you change the background colors, but they can help you get closer to the layout you’re looking for.

When you’re at that point, it’ll be easier for us to jump in and offer advice on how to apply the background colors and other styling you had in mind.