Give each guest a piece of plain white construction paper and ask them to draw a garden picture. Suggest that they include flowers, butterflies, ladybugs, etc.
Instruct them to only draw the outlines and not color anything in yet.
For safety purposes, you should assist each guest in cutting out shapes on their picture, using scissors or an X-Acto knife to create holes where it seems most appropriate. (For example, cut out the center of a flower, the wings of a butterfly, etc.)
If using an X-Acto knife, be sure to lay the construction paper over a piece of thick cardboard so that you don't scratch the table.
After cutting several holes in each picture, let the children glue tissue paper behind the holes.
Finally, let your guests color the remaining un-cut portion of their pictures using markers or crayons.
The children can tape their pictures to windows at home and watch the beautiful colors shine through!