Many women in late pregnancy have blood sugar problems. It might be best to bypass anything with a ton of sugar. Fresh fruit is always appreciated, and a relatively innocent dip can be made with 1 (8 oz.) pkg. Neufchatel cream cheese (or fat free, if you prefer), 1 (7 oz.) jar marshmallow cream, and 1 pt. fresh strawberries, whirled in a food processor or blender. It's pink and tasty, and the dairy ingredient is spread pretty thin. If you know the baby is going to be a boy, it's just possible this would work with blueberries, but I haven't tried that, and it might be more gray or lavender than blue.
A great idea I saw one time is a centerpiece made of a watermelon cut to resemble a baby buggy. It's a budget item in that it's both decoration and food. It was hollowed out and filled with a variety of melon balls, berries and other fruit. Wheels were cut (thick!) from oranges and then anchored at the sides with skewers to stabilize the watermelon. It's hard to find refrigerator space for something this big when you're planning for other food, so that might be an item to delegate to a volunteer helper if you have one, or possibly store it overnight in an ice chest with plenty of ice. You can prepare it the day before, but drain the chilled fruit and fill the watermelon just before party time. Try a Google image search for "watermelon baby carriage" - several versions come up.