Check your local Christmas tree lot for free trimmings. They can be used to make garlands, wreaths, bulk up an old faux tree, and more.
To give your couch a cute decorative look for Christmas wrap your throw pillows in red, green, or plaid dish towels or fabrics and secure at back with safety pin, this will make them look like Christmas presents. You can even add gingham ribbons or wire ribbons that will hold a bow etc.