Mixing patterns continues to be a design trend in 2020.
Mixing patterns will give your home style, character, and depth. That said, combining patterns can also be complicated resulting in chaotic and unbalanced design. In order to ensure that you apply this trend with success, here are the basic guidelines:
Use no more than three patterns and be sure to vary in size – large, medium, and small.

Distribute the patterns evenly around the room to ensure proper balance.

Use colors that are the same hues and intensity.

Be sure to break up the patterns with solids.

https://www.architecturaldigest.com/gallery/mix-patterns-in-your-home
For a subtle look, use tone on tone colors.

Another thing to consider when selecting a pattern is what style you are going for as this will set the tone of the room. Here are some examples:
Feminine
Florals in pastel colors will help you achieve a soft, airy, feminine look.

Bohemian
Vivid color and eclectic prints will result in a bohemian style. The trick is to make it look unstructured yet balanced.
Geometric
Geometric patterns work well in modern, luxe and minimalistic décor. The look is clean and angular and needs to be softened with rounded furniture and spherical shapes.
Animal Prints
If you looking for luxe and ready to go big, animal prints will deliver that look.

Global
Bordering on eclectic, a global style feels earthy and welcoming. The prints are bold with strong colors or muted colors.

Stripes
Depending on the type, stripes can give you either a farmhouse or a nautical look. Bold stripes in cool colors will give you a coastal feel while delicate stripes like ‘ticking” will give you a farmhouse or rustic vibe.

