FOSS gamedev and creative worlds

If you've read the Muirwood series of books then you know what Leerings are. Carved stone faces that can be found in nature that have glowing eyes and can emit water or fire from their mouth when invoked, or serve as guardians.

And well everyone knows what druidic circles & stonehenge looks like. These could appear like ruins, and maybe either use the decorated stones from the pyramids mod, and/or use the twiglike flat texture from the undergrowth mod to have moss on them.