How to make colorful line background patterns in PS, such as attached pictures, thank you very much!

1. Draw a vertical bar with the same width as the ribbon and gradient it;

2. Filter, twist, trim and modulate into the style you want;

3. With the circular selection tool, right-click to select the feathering value of about 15 to cut off the corresponding part, that is, it becomes virtual.

3. Copy the layer, and ctrl+T rotates and stretches some;

4. Image, adjustment, tone/saturation modulation into the color you want;

5. Repeat step 4.5 to achieve the desired effect.

hope this helps