Sometimes you just got to have some fun! Let your inner child play, when I came across this craft I thought looks like fun! Pinwheels are so cool I can watch them for hours as they spin in the wind, I find it quite relaxing as well.
This one calls for "clear shelf liner self-adhesive". I have used Con-tact before and prefer it to other brands. Check out the Amazon link above to get an idea of what they are talking about. It is not really expensive and you get enough for this craft and to actually put a shelf liner on your cabinets if you want, Remember this stuff can be used nearly anywhere you need a clear cover I'll probably use mine to put a dust cover on some of my dioramas
For more ideas on how to bring a watermelon into your life without the mess check out "The Inspiration Edit" for some other ideas