expr.cs

var p = Expression.Parameter(typeof(int));
var expr = Expression.Lambda<Action>(
    Expression.Call(
        typeof(EnumerableEx),
        "ForEach",
        new [] { typeof(int) },
        Expression.Call(
            typeof(Enumerable),
            "Range",
            Type.EmptyTypes,
            Expression.Constant(1),
            Expression.Constant(12)
        ),
        Expression.Lambda(
            Expression.Call(
                typeof(Console),
                "WriteLine",
                Type.EmptyTypes,
                Expression.Constant("{0}月は Expression Trees で酒が飲める飲めるぞー！酒が飲めるぞー！"),
                Expression.Convert(p, typeof(object))
            ),
            p
        )
    )            
);

// Run:
expr.Compile()();