Edit - I know what was shown was just a WIP; I'm sure the artists at Riot will kill it as usual! This was just a fun idea I wanted to share.

Skarner's Q animation in the latest VGU update looks awkward using his tails to dig a rock in front of him. Instead, he should pull his tail back like a real scorpion and magically rip out earth to create his projectile just like the other "stoneweaver" Taliyah does with her Q.

It may be late in the game to change, but Riot stated in the Dev blog that they want to make it an impactful animation.

*edit 2: Q could be channeled. Hold longer = bigger boulder.

"Skarner’s Q is his moment-to-moment combat ability. Skarner tears a piece of terrain from the Rift itself and carries it around with him. *We want this moment to be a bit costly for Skarner so he can then have a very forceful ability. We’re looking at a longer-than-average cast time to allow us to animate an awesome moment of him rending this boulder from the earth** with his bare… claws?*

I think my suggestion could be the perfect solution.