Mix 3 cups of cold heavy cream, confectioners’ sugar, almond extract, and vanilla bean paste using a stand or handheld electric mixer with a whisk attachment. Beat on medium-high for about 4 minutes until soft peaks form.
Layer 2 tablespoons of whipped cream at the bottom of a 9x13-inch pan (ungreased) to keep the graham crackers in place. Spread about 7 crackers evenly on that frosting layer; break the full sheet into smaller pieces if needed.
Dollop 2 cups of the frosting evenly on the graham cracker layer. Next, dress it with a layer of sliced strawberries, followed by a layer of 7 crackers sheets, then 2 cups of cream mixture, the blueberries, and another cracker layer. Finally, finish off with a nice touch of whipped cream on top.
Cover the pan with plastic wrap or aluminum foil and stack it in the fridge for 3 to 48 hours so the graham crackers can soften to a cake-like texture.
Garnish the cake with some fresh berries and as star or rainbow sprinkles. Slice it and dig in!