Add a splash of color to patterns in Photoshop in just a few easy steps. First, open a colored “paper” with a solid (or gradient) color on it. For example, use purple and pink hues for the paper background. Open another file with a pattern you would like to colorize. Convert the pattern to black and white, Image > Adjustments > Convert to Grayscale. You may want to increase the contrast a bit. Then pull the pattern image over to the paper image file.
In your Layers menu, check the layer order. The pattern layer should be on top of the paper layer. In the Layers palette, change the blending mode of the pattern to Soft Light. Depending on your pattern and the paper, you may also want to lower the opacity of the pattern.
—Jennifer Foy, Unisub