We used bits of old wooden pallet, sanded down and then they got to work with coloured pens. We've used linseed oil to waterproof the signs which will go up in the greenhouse, around the insect hotel they made and in the courtyard.
Rosie, by the way, is the school rabbit.
This didn't work out very well in the end. Despite looking great initially, the ink ran very badly even before we'd put them outside so we had to abandon this idea.
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