One of our favorite sources for bath accessories is Manufactum; we especially like the oiled ash Thermowood pieces (made from wood treated with a thermal process that renders it moisture, mold, and mildew resistant).
Above: Thermowood Bath Mat; €98.
Above: Thermowood Toilet Set with zinc-lined box (replacement brush heads available); €59.
Above: Thermowood Bath Tub Rest; €79.
Finally, get more ideas on how to evaluate and choose the various accessories for your bathroom in our Remodeling 101 Guide: Bath Accessories.