Take a few knobby squashes. Or perhaps I should say borrow a few knobby squashes.
Look closely to see the patterns.
What colours do you see?
Now, with your special sketching pencil, roughly sketch the shape of your favourite one.
Next, tear appropriately coloured paper into squares.
Then, carefully glue the coloured shapes onto your sketch.....
until you have covered the whole squash - and it resembles the one you chose to represent.
Finally outline the whole with black marker, cut it out and mount on black paper - but perhaps it's best to come to the classroom to take a look.