Little boys will love the idea of working like daddy in the garage and everyone will appreciate the fine motor workout you can get from matching nuts and bolts. This idea (and several more in the same post) from Counting Coconuts.
Irresistible Ideas for play based learning marble play Throw pool Noodle chunks in the water table with marbles and block ( maybe add velcro dots to connect. Cheap way to make a kindergarten Marble Run play centre!
Make a pattern, repeat it, using elements. The black felt or paper background makes the patterns "POP" and intensifies the pattern. Reggio inspired approach to math- provocation at Mathematics and Science in School District (Richmond) ≈≈