This is a classic pastry cream often used in bakeries and restaurants. It can be used as a filling for cakes, pies, and breakfast pastries. To make a lighter filling for cream puffs and eclairs, fold in plain whipped cream.
Almost Buttercream Frosting (with Marshmallow Cream) - I can't stand traditional buttercream. I don't really like marshmallow cream either, but anything as an alternative to buttercream is worth trying.