Combine the gunpowder and hallucinogens. Gunpowder explodes when contained, but burns nicely when in the open.

Also, the "Goblin Dust" grenade is fun at low levels. (Dust, ground glass, black pepper, hot pepper, anything itchy/sneezy/irritating. Put it in a very thin paper packet or ceramic globe and huck it at somebody's face. ALAKAZAM! Instant escape!)