Well, I think the themes in 'The Strange Idols Pattern and Other Short Stories' could involve the concept of mystery itself. The title implies there are strange elements which usually bring in the theme of mystery. Additionally, it may touch on the theme of isolation. If the idols are strange, the characters might be isolated in their understanding or in their relationship with others because of their connection to these idols. And there could be a theme of the search for meaning, as the characters might be trying to figure out what the idols and their patterns signify.
One of the main themes could be the exploration of the unknown. The 'strange idols pattern' might suggest something mysterious that leads to themes like discovery and the unease that comes with the unfamiliar. Another theme could be cultural differences if the idols are from a specific culture. Also, in short stories, there's often a theme of human nature, perhaps how people react to the strange idols pattern, whether it's with fear, curiosity or greed.