What is the cheapest way to get exterior siding to match when it consists of three different types (vinyl, brick, and wood)?

Did you know vinyl siding can be painted? Most folks don't know that, but it can be done. You just need to clean it extremely well, use the correct primer and top coat with a 100% acrylic paint.  This way perhaps you can paint the wood and vinyl to compliment the existing brick. Also, you may want to clean the brick.  Depending on the age of your home it is amazing how much of the color of brick can be covered up with grime.  I cleaned the brick on my 80 year old home and it looks like a new house.  This can make a huge change in appearance.