I threw my four year old son (and 18 of his friends) a bug party.  We printed up a cute invitation on bug paper with a bug poem. Each child was greeted at the door with a bag full of stuff (headband, pipe cleaners, styrofoam balls) to make their own antennae. Once they were done, they went over to get their bug tattoo. When everyone arrived, we started the games. First we played "give the ladybug back her spots." I made a ladybug beanbag toss game (drew a giant ladybug on red posterboard and backed it with foam board)and cut her spots out for holes. My mother-in-law made black beanbags for us to use as the spots.  Every child got three throws.  The winner received a gift certificate for ice cream, while everyone who played got a jar filled with live ladybugs. (I didn't actually hand these out until the party was over and I instructed them to let them loose in their own garden.) Then we played pin the spider on the web. I bought the stuff you make webs out of for Halloween and set up a huge spider web.  I painted on two spots for the kids to aim for. I also bought spider rings and tied name tags on to each ring for them to put on the spots.  Again the winners got ice cream gift certificate and everyone received a spider ring. Next we went on a bug hunt.  I bought bug nets from the dollar store and painted their names on each one. I had already put vinyl bugs all over the back yard. I told them to look out for the "gold bug" - a bug I colored with a gold marker. The kids that found the most bugs and the one with the "gold bug" again won ice cream gift certificate.  Everyone got to keep their nets and bugs. After play time and cake time, we did a caterpillar piñata. I think the party was a success. I received many complements and my son had a great time!!  The one thing I did on everything was to put names on them prior to the party - the bug jars, the bug nets, the antennae bags, etc.  It kept the kids from fighting over who gets which one - there was no discussion since their name was on it.