I don't like people digging thru the undealt cards in the middle of the hand to pick a new trump color. We used to take out the "0 cards" and shuffle those and use them specifically for the trump color. This solves both problems.

Cut out the above card and laminate. Resize if necessary in excel. Place a marker on the color that is trump. For the random color in the beginning of each deal, roll a die and use the corresponding number. The color card will fit in the box when laminated.