Favourite RPG Accessory
If Dice count as “accessories”, then I nominate the awesome precision machined metal gaming dice created by Amber Rix. I freaking love these dice more than any other dice I own, and I would (metaphorically) kill to see her make other polyhedrals like this. I have a moderately staggering amount of d6s, but unless I need a specific type (Fate dice, HERO dice), I generally use these.
Why precision, machined dice are not a common thing in our hobby, I have no idea. Sure, lots of companies make metal dice, but AFAIK they’re just die-cast and other than being more expensive are no better or worse that you typical Chessex or Koplow dice.