Hey, there's this outfit in New Jersey that recycles no-hoper used pianos...

LOL. I'm waiting for the laser-guided anvil.

And the ultimate munitions for your every anti-tyrannical-dictator needs must surely be the GPS-enabled graffiti-spray-can so that you can vandalise all of the portraits. This would have an additional benefit in that the Regime loyalists would have to clean/replace the portraits giving you a prime opportunity to take them out. Maybe the spray paint should contain some chemical that will react with detergent in a mildly explosive manner, thus saving you the hassle of waiting.