Ingredients for making crop circles are pretty simple. All you need are:
Farmers generally do not like people or aliens invading their fields and ruining their crops, so we recommend creating crop circles in safer environments such as in your yard, driveway or school playground.
You can make child-sized crop circles easily.
Instead of intruding upon or destroying valuable wheat fields, and gathering heavy planks of wood and rope, you can substitute these:
Pound the tent stake (or stakes) into the ground, tie the string or yarn to the stake.
Have the child or children walk in circle with the plank of wood in front of them.
Press the grass or vegetation (or snow, sand) down with the plank of wood as they walk.
Soon they will have a perfectly round circle to experiment with further.