What you will need:

small containers to serve food: jar lids, egg cups, ramekins, shells, etc., or a small tea set if you have one
small bites to eat: berries, nuts, tiny club sandwiches, etc.
a picnic blanket
cushions

How to do it:

1. Collect miniature serving containers and prepare food. Think blueberries served on a scallop shell, hummus in an egg cup, sandwiches cut into eight and served on a jar lid, etc.
2. Set up the picnic blanket in the garden (or inside if raining).
3. Lay out miniature picnic food on the picnic blanket.
4. Sit down to tea and enjoy eating the dainty little servings!