Pinterest is a great source to find decroating ideas.  One of the best for us was “shiplap” made from quarter inch underlayment from Home Depot.  It costs about $10 for a 4’x8′ sheet and you can request to have it cut in 8 inch x 8 foot strips that you just tack on with brads over our existing paneling.  If you are going over drywall, you may need to apply liquid nails.  Our entire house was filled with different color paneling, no drywall.  We removed the panelling, updated the wiring and put in new insulation.  Then we rehung the panelling and painted it black.  The 8 inch strips were tacked up with nickels as spacers: