My group loves playing with the 'treasures' as they call them ... little gemstones we've collected and they are awesome on the light table but work just on a plain white work space to help the colors pop ... they make designs, pictures, tell stories with them, sort and so forth.
We also enjoy 'color scientists' ... food coloring in water with ice cube or other 'sorting/mixing' tray and eye droppers
Water play keeps them quiet and busy ~ if you put out little 'individual' bins it helps keep the water contained and quiet and you can put animals or whatever interests your boys ~ mine like zoo animals or dinosaurs in there.
With the playdoh think outside the box about what you put out with it ~ so sometimes instead of traditional cookie cutter and rolling pins I put out feathers, pipe cleaners, buttons, flower picks and they create 'creatures' with them.
Pom pom sorting is one they enjoy too ~ pom poms, ice cube trays and chop sticks ... they have to pick up the pom poms and place them in the ice cube tray using the chopsticks only if they are not ready for chopsticks you can use 'tongs'.
Games wise I have a few like 'dinosaur bingo' that they enjoy ... you can make up your own themed bingo games online if you google templates for it and than just laminate.