To start with, nice tree! Makes me want to build a city of tree huts.
About the pillar, I like the second version the most in both size and shape. I agree that it looks too high-tech and I think the main reason for that is that thereās so many runes that the stone thatās left looks more like a stylish metal casing of some sort. One column with 2-4 runes on each side should be enough.
Iām not sure what the colored part of the ground piece is supposed to be, but I think it too adds to the high-tech feel. It looks a bit like something from a sci-fi movie that you stand on and say āActivateā. It would be more ok if it was a rune there as well, but isnāt it supposed to be the runes on the pillar that makes it fly?
Something thatās been done before (in Warcraft and other game) but looks good is to attach flying stones to the ground with a chain or two. Just a thought, if you donāt feel that itās too done before.
About the color, I donāt know. I like the blue, but that could just be because @TobiasSabathius use it on his runes. I think the purple looks kind of evil though (which makes me a bit worried about @SteveAdamo), probably because purple is often used as a colorful version of black.
I hope to see beams of light going up from those pillars at some point.
Keep up the good work!