My absolute favourite so far is this 'flower' using the metallics, in gold, copper, and bronze, on a black base.  Around the edge is a ring of gold dots.  The design is on both sides so there is no 'right' side.
When the paint was dry, I added several layers of resin to give it protection from usage and sunlight.
Dimension: diameter of each fob is 35 mm/ 1.37 inches and the thickness is 4.5 mm/ 0.18 inch, each slice has 1 holes with 3 mm/ 0.12 inch diameter each, key rings measure 25 mm/ 0.98 inch in diameter.
Material: the fobs are made of wood, they are lightweight and solid, key rings connectors are made of stainless steel, which is sturdy and can serve you for a long time.