there're two types of texture. Bright and Dark.
textures are mostly used for the background. 

◆ Bright Texture

Examples:

Credit: http://camilibot.deviantart.com/

◆ How do I search for it?

1) Go to deviantart.com

2) Type in "wattpad pack"

◆ Dark Texture

Examples:

Credit: http://4mira.deviantart.com/

◆ How do I search for it?

1) Go to deviantart.com

2) Type in "Dark texture pack" or "texture pack"

Other than using textures, I love using stock as my background.

◆ Stock

Examples: 

Credit: https://inadesign-stock.deviantart.com/

Credit: https://madam-e.deviantart.com/

◆ How do I search for it?

1) Go to deviantart.com

2) Type in "premade background"