My old group used to use Explosive Runes offensively by intentionally failing to dispel it.

One time (DM only allowed it once), another player threw a wooden box filled with paper w/ explosive runes on them at a boss (well, his familiar lobbed it, I think) and dispelled.

Another time there was an army marching on a settlement that we wanted to protect, so we utilized the "Dispel Magic Canon." Wherein the other guy laid out the papers on the ground staggered in a long line, then I used Sculpt Spell on dispel magic to make it a line attack and wiped out ~1/4 of their forces in one shot.