finding/painting replacement tiles

[ibgibson]

I am looking for around 20-30 replacement tiles for my 25-year-old bathroom walls. The existing tiles are marked 'Spinx', 27, Holland, on the back and are 150 x 150 mm (or the old 6-inch size) and are faintly mottled, satin-textured cream or ivory in colour. I've contacted Sphinx Tiles in Holland, who said they'd get back to me but haven't. If I can't obtain these anywhere, does anyone know of a firm which will mix matching tile paint to order? I'd be grateful for any advice.