This is a classic desert that works really well for Independence Day (Anything with berries does, really). It's quick to put together and very pretty, so keep it in mind for next year!
All you need is sponge cake, pound cake, or lady fingers; canned custard or pudding mix; whipped cream; and fruit. Then layer them up however you want and let it sit together in the fridge for a few hours to meld.
I used lady fingers (brushed with Cointreau), vanilla pudding, whipped cream, strawberries, blueberries, and raspberries. The amounts depend on your serving dish and your preferential ratio of fruit to cream. I used 2 packs of lady fingers, 2 boxes of pudding, 1 can of whipped cream, 1 medium container of strawberries, and 1 pint each of blue berries and raspberries. My layers were lady fingers, pudding, strawberries, whipped cream, lady fingers, pudding, whipped cream, blueberries and raspberries. I probably could have used more berries.