This article covers the basics--Do it yourself or get family or friends to help, shop secondhand stores, check out seconds, spruce up old pieces, ask about sales and discounts, and remember "... there's no better budget stretcher than your own imagination." Link: Design Ideas on a Budget : Decorating : Home & Garden Television
I have a concrete garden bench at the end of my bed, btw. It's not going anywhere when the dogs bounce off and on it. (Your legs will learn to avoid it.) Fancy sheets make cheap coverlets; and I have a fancy rug runner on the dining room table.