Here is my attempt at a new Logo.
I thought of using the Juggernaut as the most iconic Unit in the game in the Logo and due to the horn incorporated it into the text as the L.
It could be made a bit clearer, but I'm not that good at design...
The crystals of different colors are rather obvious, referencing the crystals of the Power Wells and the different Orb colors.
Placement is based on the Combined Orbs: e.g. Frost + Nature = Stonekin and Frost + Shadow = Lost Souls, while Frost and Fire are Opposites. I know, Amii Phantom, but that is the exception...
Sadly I'm also pretty bad at colorizing, which is why the Juggernaut is uncolored and only overlaid with a texture.
If anyone likes my design, feel free to edit it
P.S. I'd vote for Yellow's design, looks awesome!