The first real 3d Hexgrid enviroment has come to Unity by the hands of 7Ye.
There is the link to see all the sketchfabs, images, and access to buy: http://u3d.as/sgo
The pack has complete documentation, full HD textures and beautifull outcomes. Here I drop you some images. Unity Asset Store make it public at some strange hourse in my timeline (11pm), so in the next days I will show you more ;)