If you do want textured or colored backgrounds, the text should be large and contrasting to stand out. The following list links to samples of sidebars, textures, and patterns I've created, some using objects and photos I've scanned:
Sidebars
Blend
Shadow
Torn
Pines
Flower
Lace
Burlap
Canvas
Mud
Cement
Grain
Stucco
Fiber
Twirl
Dabs
Cube
Cat
Rosebed