In this beginner level tutorial I want to show you a very quick and easy way to make a nice vintage background for your works in Pixelmator.
Open Pixelmator and create a new image by choosing File > New. To get results closest to those in this tutorial, choose the 1400×900 image size preset in the New dialog. However, feel free to choose any size you like.
Choose Filter > Generator > Stripes, use 10 for the Width and 100 for the Sharpness. Now choose you favorite colors for the stripes and click OK when done.
Choose Filter > Distortion > Circular wrap and play with the settings until happy.
To fill the hollow in the middle of the stripes choose Filter > Distortion > Pinch Distortion, use 300 for the Radios and 50 for the Scale, drag the center point to the middle of the hollow and click OK. Repeat this action as many times as you need to get the result you want.
To delete the white stripes select Edit > Select Color and choose white at 50%. Then hit the backspace key. Click to select the Paint Bucket Tool and enrich your image with different colors in order to make it more vivid.
Import any old paper texture and place into your document. Here's an example at Lost & Taken
Click to select the striped layer, choose Layer > Bring to Front, then change the Blending to Multiply and reduce the Opacity to 80%. In order to get more powerful effect, click to select the texture layer, choose Image > Brightnes and Contrast and raise the contrast to 10%.
Fell free to experiment with colors, stripes and all the other possible settings. Now you can use it for your cards, flyers or whatever you want to. This vintage rainbow background will give a cheerful look to any of your work.