Saw this wonderful, but "plain" pink shopping bag whilst in M&S today £3.99 and saw customisation potential!
Sewed some cute little felt flowers, made a button hole in middle. Sewed some buttons onto bag (I used same colour as bag so I could remove flowers for when I wanted a mature plain look!). Hey presto a customised shopping bag with removable/ changeable embellishments, which can double as an activity for fine motor for kids should the need arise.
This idea would be perfect for a Mary, Mary quite contrary rhyme sack. Of course if you added buttons in matching colours to flowers you could use it for colour matching, or make additional flowers so kids (or you) can change the flowers around.
"Much education today is monumentally ineffective. All too often we are giving young people cut flowers when we should be teaching them to grow their own." John Gardner