MinWax makes custom-blend water-based stains. Take a piece of your current furniture (a knob or a drawer, etc.) to Home Depot and have them match it.
You can buy whatever unfinished headboards you like and stain them to match your existing furniture. Be sure to add a coat of polyurethane on top to protect the finish. (Tell Home Depot what kind of wood the new headboards are made of; it makes a difference for matching the stain.)