Nope.What you shoot are missiles that look like orbs. Not the orbs themselves (too bad IMO...)
But if you want orb activity worthy of a screenshot, try setting the barb's Frenzy to +95% attack speed, and equip a weapon with 100% chance to cast frozen orb when attacking. Watch what happens.
As for the most activity on the screen at any time... set LightningStrike in missiles.txt to pierce (if I remember correctly it is CollideKill), velocity 60, range 40 and set the skill in skills.txt to 40 bounces and detection radius 60. Use the skill in a crowd. Watch the fireworks.
And to actually make it useable, set bounces to 5 and give it a 1 second timer.