A few thoughts about Buckminster Fuller… He attributed his aesthetic development to his experience as a kindergartner. Here are a few images of kindergarten gifts, next to Fuller’s 1957 dome (click to enlarge):
There are a number of commercially available products and toys that people can try out and explore some of Fuller’s ideas. Here is Tensegritoy, one that comes to mind:
Other toys rooted in geometry include ZOOB and Topobo, and some other geometry related toys like ZOME. I think some of these could be creatively reappropriated so they become an educational or creative medium.