Make bowling pins and balls from construction paper and hang them around the party room.
Take black, helium filled balloons, and draw white finger holes on them to make them look like bowling balls. Let them float around the party room.
Make sign that says, "Welcome to (your child's name) Bowling Alley", and hang in on the front door.
Buy inexpensive, child sized shirts, and write each guests name on the left shoulder of a shirt, and your child's name bowling team across the back. The guests can wear them during the party, or take them home as favors.
If you own any bowling balls, shoes and bags, use them as decorations. The shoes can be peeping out from under the furniture, and the ball and bag can be used as a centerpiece.
Serve foods you would normally but at the bowling alley concession, pizza, hot dogs, popcorn and French fries. You could also include some healthier choices, like fruit, cheese and cut up vegetables.
Making a bowling ball cake is simpler then you might think. Pour the cake batter into a greased, oven proof, 2 ½ quart bowl, and bake. Allow to cool, and then flip the bowl over to remove the cake onto the serving plate.; Cut out the three finger holes, and out white tea light candles in each hole. Frost the rest of the cake in chocolate frosting. You can add your child's name using decorator icing.
Let the guests make their own "Bowling Alley banana splits!". Since spilt is a bowling term, this treat ties in nicely with the theme. Have a few different ice cream flavors, bananas, cherries, sprinkles and whip cream, and let the kids go wild!