Use bright colors to decorate; green, pink and lavender all would work well. Put different colored tablecloths on the tables, and use small flower pots to hold the silverware and napkins. Hang colored streamers from the tress if you're having the party outdoors, it will add to the atmosphere. Line small flower pots with fabric and fill with small, colorful candies like Skittles and M & Ms. Stick a lollipop in each pot to look like a flower. Make a canopy over the party table with yellow and green streamers. Attach them to the chandelier or ceiling and have them float out over the chairs. Fill water cans with bunches of fresh flowers and scatter them throughout the house. Use a small baby pool to make a pond. Fill it with water, and put in plastic frogs and ducks. Add some toy boats as well. Be sure the pond is always supervised to avoid accidents.
Buy several round, flat rocks from a craft store and paint bright red. When the guests arrive give them each a rock and a black magic marker to make ladybugs to use as table decorations. Write each child's name on the bottom so they can take them home when the party is over.
Serve the food in new, clean flower pots. Make jelly sandwiches and cut them into flower shapes with a cookie cutter. Serve cut up veggies in rows to look like a vegetable garden. Put the dip in a small tin pail or flower pot. Make flies on a log by filling celery sticks with peanut butter and sticking on some raisins. Serve lady bug treats. Cut a red apple in half. Stick chocolate chips in point first to make spots. Serve each bug on a lettuce leaf. To go along with the cake, serve cups of dirt. Put a layer of chocolate pudding in the bottom of a clear cup, add smashed up chocolate cookies, and put gummy worms on top. Serve with mini plastic shovels bought at the craft store. Pour drinks from new, clean watering cans. Make flower shaped sugar cookies using a cookie cutter and lots of colored sprinkles and icing. To make a flower cake, bake an 8" round cake for the middle. For the petals, you can either bake a sheet cake and cut out petal shapes, or use Twinkies. Frost the round cake in yellow, and the Twinkies in the frosting color of your choice. Put the cake on a large cookie sheet. Draw the stem and leaves with green icing.