71 RBG LEDs, 3 transistors, and 1 ATTiny85
I figured that this configuration would save me programming for a LED
  Driver IC. Does anyone have an input on this evil plan? Also, would a
  regular 2n2222 appropriate for that?


Yes to add a low side switch is a common way to source more current than the pin. One problem with using an NPN is you also have an 0.7V drop there which also uses some energy, what you have should work.


  Does anyone have an input on this evil plan? Also, would a regular
  2n2222 appropriate for that?


A mosfet with a logic level input would probably be more appropriate if running on a battery to get minimal power dissipation in all parts. In the place of your switch, you can input the GPIO. Mosfets are capacitiavley  coupled so they waste no current to switch on. You do however need to make sure your Vgs (voltage between the gate and source) is high enough or it will not turn on. You can see that curve in the datasheet of the mosfet you select. It will also tell you the relationship between the resistance and Vgs.


Source: http://blog.solutions-cubed.com/h-bridge-control-of-a-motor-low-side-switch/