Slop, paint, apply or smear a mud mask on someone.
Write a word, poem, letter or story for someone you like by photographing only natural things.
Measure wind speed and direction by blowing bubbles, then report your findings online.
Plant something in your home or garden. Take a photograph of the seed.
Cut a square of turf and shake out the inhabitants.
Find, stalk and photograph every producer and consumer in a food chain.
Make a giant sign.
Take photos of three different animal tracks near your home or on holiday.
Draw a map of where your local free food supplies are.
How many different animals does it attract?