What are these green underground triangles?

[Beechlgz]

I'm just messing around seeing what mods work with what. I would like to know what mod these come from and what their purpose is. Can anyone offer any input?

They're at about y 10 and keep showing up near spawn on each world. They sort of float and spin.

Here is my mod list:

Biomes O' Plenty
Natura
Tinker's Construct
Local Weather & Storms
CodeChickenCore
Forestry
Glenn's Gases
Fossils and Archaeology Revival
Enviromine
Industrial Craft 2
MrCrayfish's Furniture Mod
Millenaire
Mo' Creatures
Underground Biomes Constructs
Sound Filters
Custom Ore Generation
More Furnaces
Carpenter's Blocks
The Spice of Life
MalisisDoors
Plant Mega Pack
Trapcraft

 

[Eruantien]

I'm pretty sure that's Local Weather & Storms doing that. However I have no idea what they're there for, except to... highlight spawn, perhaps? Beats me.

 

[Chaka]

I'm pretty sure that's Local Weather & Storms doing that. However I have no idea what they're there for, except to... highlight spawn, perhaps? Beats me.

I think that is what is causing it as well.

 

[darkeshrine]

I'm pretty sure it's CodeChickenCore. That's the only mod listed that i've got in my pack and i've got the same things. If you dig under it it should have red pseudo-blocks from Y: ~3 down.

Edit: Oh, and they seem to mark the area around 0,0(the world's center).