With this website you can create every plaid pattern imaginable. Just pick your colors and start weaving them together.
Digitally, you can use the patterns to decorate your computers or websites. Use them as twitter and blog backgrounds or wallpaper for your laptop, iPad, iPhone and more. Because you can tile the images, they are also great as backgrounds on larger monitors.
If you're a weaver, you can use PlaidMaker to mock up your designs before you begin on a new fabric.