Get a packet of coloured chalks from the poundshop and let your kids loose on your paving slabs - one slab, one complete picture. Take a photo of your budding Picasso next to their work of art, have a scrubbing brush, bucket and water to hand (if it doesn't rain that is!) and give a small reward for scrubbing it all off again! Your patio may even get to look cleaner than it was before!
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