Summarize this article:

Craft and art supply stores sell canvases in a wide range of sizes, so you can find one to fit in whatever space you want to hang it. For a lighter fabric, choose a blank, white canvas, and for a darker fabric, you can go with a dark canvas. You can mount any fabric to canvas, but a flexible, lightweight fabric will allow you to make sharper-looking edges and corners. A light cotton or cotton-blend fabric will wrap easily and beautifully on a canvas. Purchase enough fabric to cover the front and sides of the canvas, plus a little extra for mounting to the back of the frame.

Summary:
Choose a fabric and canvas that will beautify your space.