Here's a tester I completed for a Strange Aeons objective counter. I simply used a bag of Mini Mythos that I cleaned up with an Xacto and mounted it on GW 2" bases. I then primed it black. I underpainted it a hard contrast style with some off-white/light grey paint and then some copper paint on top.
After that it got a layer of Verdigris water based stain to tone down the yellow in the copper paint and add some hard lining. To finish it off the paint I added some Model Color Verdigris glaze which I allowed to pool and then rubbed off while wet with my thumb and some flat brushes.
To top it off and make it more mystical-looking I added some 4mm costume jewels for eyes. Seen here are purple/orange/yellow gems. I also got some pale yellow/green ones to add to some others.