Possible Clues:

• Shape of things to come in cricket at Kennington and in Adelaid and Darwin?
• Squashed O's
• Microsoft Paint shapes
• Most toilet seats
• Most cricket grounds
• Shapes of many roller rinks
• Running-track shapes
• Where cricketers shape up to play at Kennington, Adelaide and Darwin
• Flattened circles for a salvo
• Cricket grounds at Kennington, Adelaide and Darwin