Salt - Two elements, sodium and chlorine. Normally deadly, but as sodium chloride it's stable. Science is wonderful and that's why I like salt. Plus it's delicious.
Niobium - This metallic element turns a dazzling blue when it oxidizes.
Iron - Pure iron crystals, fresh from the rock, look nice. Plus it's one of our staple metals.
Chromium - A beautiful metal. Adding various other elements to it will create vivid colors. Chromium-chloride makes purple.
Imagine if the potassium in bananas wasn't stabilized by the rest of the compound.