Most fields allow frags and thunder B's with the exception of Hell Survivors (something about their new insurance), indoor fields usually do not allow smoke or pyro type grenades (Grenades you have to light or explode). For frags you have airsoft innovations Tornado and Cyclone grenades and Enola Gaye now makes a Pyro 'pea' grenade.
For smokes most people use Enola Gaye burst or other paintball smoke grenades.
For flash/bangers you have the Thunder B and Thunder V (Valkens rip off) and airsoft innovations has just released a "burst" grenade of their own and make caps for the tornado grenades to turn them into bangers.
There are also the M203s which include shower/cap style shells and Tactical Game Innovations TAG launchers and shells/ammo. My favorites being the Reaper and Arch Angel shells.
TGI also makes smokes/frags/bangers but I have only seen them at AMS events so far.
