All you need to start is an old sewing patter, some Tim Holtz Distress ink, or any ink would probably do, some stamps and an acrylic block for your stamps if needed.
Your patterns don't have to be new. I bought my sewing patterns at my local flea market, they were three for a dollar. Take out a piece of the pattern big enough for your project and lay it on your crafting surface face down.
Next get out your inks and start stamping... That's it! Easy peasy.
Make sure as you stamp you rotate the direction of your stamp so the images are not uniform, unless that is what you are going for.
Here's a video of me making some for a canvas I'm planning:
In this video I wanted a sort of vintage color to it so I used some Distress Ink in the Walnut Stain color. And because my canvas is going to be a floral piece I used the floral stamps I had; Tim Holtz Stampers Anonymous - Flights of Fancy, Stampin' Up - Bloomin' Beautiful, and Prima Marketing - Hello Pastel - #563004.