I googled some images of things i knew we had around our yard that Tara could collect. Glued the 12 pictures onto the egg carton and presented it to Tara
She loved it, and set about on her journey to search for her 12 items. This could also be done for a younger child with just a half dozen egg carton as i does take a while to collect all 12 items and all the hard concentrating to work out where they would be.
Grass was the easiest to check off the list first