I do love tunneling and some of the current versions are totally fab. Inky and metallic ooze and the scarabs (on seeing the flying scarabs I was tempted to make a 'swarm' character who was ALWAYS a swarm of flying scarabs). Lovely!
But compared to the other travel modes there really is a paucity of choices.
Two that immediately occur to me are electric tunnelling and arcane tunnelling. Perhaps these could even be cobbled together with existing assets, as there are no less than three electric flight powers and two electric speed powers... a discharge moving along the ground would probably be fine. Likewise with an arcane rune moving along the ground.
Some folks have said that they see tunnelling's function as being much like an imagined 'stealth' or 'invisibility' power, so likewise varieties that involved a shadowy or near-invisible outline would probably also prove popular.
Just an idea. No pressure.
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