Basic slipcovers are very easy to make.
Just throw a large piece of fabric over the furniture, tuck in at the sides, and you're done. Or get several lengths of fabric and sew them together to make one larger piece. You can get fancy and sew trim such as tassels or braid or lace around the edges of the fabric. Safety pins can help hold throw slipcovers in place, as can small strips of foam tucked in between cushions. If you want something a little more fitted, most commercial pattern companies have a few slipcover patterns.