There are many different types of Photoshop flyer backgrounds available, depending on the style and tone of your flyer. Some popular options include:

• Solid colors: Solid colors are a simple and effective way to create a background for your flyer. You can choose a color that complements your text and images, or that creates a specific mood or atmosphere. For example, a black background can create a sense of luxury or sophistication, while a white background can create a clean and modern look.

Gradient colors: Gradient colors can add visual interest and depth to your flyer background. You can create a gradient using two or more colors, and you can adjust the direction and angle of the gradient to create different effects. For example, a vertical gradient can create a sense of height, while a horizontal gradient can create a sense of width. 

Patterns: Patterns can add a fun and unique touch to your flyer background. There are many different types of patterns available, including geometric patterns, floral patterns, and abstract patterns. You can choose a pattern that complements your text and images, or that creates a specific mood or atmosphere. For example, a geometric pattern can create a sense of modernity, while a floral pattern can create a sense of femininity. 

Textures: Textures can add depth and realism to your flyer background. There are many different types of textures available, including wood textures, stone textures, and fabric textures. You can choose a texture that complements your text and images, or that creates a specific mood or atmosphere. For example, a wood texture can create a sense of rusticity, while a fabric texture can create a sense of luxury. 

Images: Images can be used to create a variety of different flyer backgrounds. You can use a single image to fill the entire background of your flyer, or you can use multiple images to create a collage effect. You can also use filters and effects to transform your images and create a unique look for your flyer. For example, you could use a black and white filter to create a classic and timeless look, or you could use a pop art filter to create a fun and eye-catching look.