I use brick bases and various rods that will connect to them to hold parts for customizing - such as using the clear Mega Construx rods that are meant to make figures & vehicles look like they're flying to peg into a Joe or Mega Construx back to hold a torso for hands-free painting.
While at Dollar Tree today, I
found these. Handy for storing/sorting parts and with the block lid, can be used for holding a part for painting, all for $1.25!


I stopped in to find some of the Final Faction stuff (got the comic book and the latest accessory packs) but was more excited about this find!