D&D base for scrabble, rummicub or playing cards

This thing serves as a base to hold up a Rummicub or Scrabble tile. I'm using it in a tabletop game to represent characters for which I don't have a model.

I'm using Rummicub - the tiles for my set are 19mm wide, and 3.5mm thick. A scrabble set I have has 19x4mm tiles. Playing cards are 57x.25. Keep in mind that both rummicub and scrabble have had many different releases - there's a good chance your set uses different dimensions.

To improve the visuals, you can wrap a tile with paper with