I usually recommend going for a contrast if you really want to keep the original tiles. i.e remove tiles nearest the unit and fit same size different colour e.g. dark brown.
Personally I would take all the tiles up and replace with new. You will find some really smart new designs that will compliment your new units better. It does not look like a big area so wont need too many square metres of tiles - most of us would quote to lift and re-tile in one day or you could do it yourself in a weekend.