LBCs (or Lazy bastard customs) are a fun and quick way to customize. They often require little or no paint. Just a head or leg swap or changing some gear and equipment can give you a brand new figure with minimal effort.
For fun, I slapped together Mirage. Originally released as part of the Mega Marines in the mid-nineties, he is a pretty obscure character. However, his original mold saw several re-releases during the GI Joe vs Cobra /Spytroops/ Valor vs Venom years.
Anyway, here is my LBC version of the character.