I only have the SRD available right now and that describes it as "a beam of crackling energy" but yeah, this is far too attractive a stylistic opportunity to not make use of it.
Besides, "crackling energy" is pretty broad already and leaves room for a variety of colors, sounds, and particle effects. Going from there to "magical 120ft tentacle that disappears after a second" isn't that much to ask for.
EB is ripe for reflavoring. My favorite version was just gun. I made a cowboy warlock with magic revolvers he shot his Eldritch Blasts out of. Was lots of fun.
Nah, it’s just that the curse didn’t entirely take; which is why she’s a draconic bloodline sorcerer. She’s still kind of a dragon, and tends to vastly overestimate her abilities (she is the tank, and has 16 health at level 2)