After explaining the 4 basic shapes (Triangle, Circle, Rectangle and Square), I gave each kid one Triangles, four Squares, three Rectangles and two Circles.
(you can download and print this example)
Then I asked them to take the big yellow rectangle. Then the small yellow rectangle and glue it like the example I had brought.
Now they had to look for a blue rectangle (and don't confuse it with the blue squares! :)
The 4 squares were the most fun to glue! They could already see the bus in shape!
Triangle was a little tricky but yet they did a great job!
And then the 2 circles so the bus could drive away!