ИНЕРТНЫЕ МАТЕРИАЛЫ. Как не надо.
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Дело не в материалах, естественно, а в способе их использования. 
Совсем недавно на площадке "Камоники", покупая глыбы шунгита, интересовалась – покупают ли крашеную в вырвиглазные цвета каменную крошку. Не слишком часто, ответили мне, но покупают. Однако больше красить не будем, сами видим, что ужас ужасный. А не будет предложения – не станет и соблазна отсыпать бордюр в саду ядовито-синим, например.
Хотя порой дело вовсе не в цвете... В общем, "ужас-ужас"..