Fun, easy activites for a 2 1/2 yr old and a 4 yr old?

I need easy ideas for entertainment. Somethin that can easily be done in home but also a little more invoked than just coloring. Another thing is I want it to be avtivities that the 2 yr old will understand and enjoy but won't bore the 4 yr old. Neithe of them like getting their hands dirty and they're both boys. Any ideas would be appriciated