Respawn Matched Blocks in Puzzle Game

Hello everyone, I was wondering if anyone could show me an imagine of a blueprint set up of how I could consistently respawn matched blocks in a Puzzle Game to keep respawning. For example, the first photo shows you the blocks that haven’t been clicked on yet and the second photo shows the two yellow blocks matched to each other now how do I get the blocks to go back to the default color blue and have the colors randomized and changed to keep the game going and keep the guessing going? Any suggestions and help would be truly grateful.