1.3g mortars detonating into the crowd, usual stuff. Perhaps 5" shells in 6" tubes, or a reduced lifting charge. Either way, a star shell incendiary to the eye at 300fps must do wonders for visual acuity.

More Thailand firework mishaps this year only:
http://www.liveleak.com/view?i=855_1327420296
http://www.liveleak.com/view?i=482_1327529165
http://www.liveleak.com/view?i=7cd_1325682263
http://www.liveleak.com/view?i=c2f_1338203917

An amazing country to experience away from the tourist areas in my opinion.