I showed you once how to make a low-budget rug from two small accent rugs, if you're penny-pinching. But, you can also mix rugs with the same pattern in different sizes to create a unique visual focal point (which may or may not be inexpensive) with a patchwork look. Try combining a couple of runners with a pair of 3-x-5-foot accent rugs. Stick with rugs that don't have a border all the way around (i.e. not Persian rugs). Make sure to use rug pads, otherwise the arrangement will move around and look messy. If you have an existing carpet that you're not quite a fan of, this is a great way to draw attention away from what lies beneath. Try Ikea for some inexpensive options.