I've posted a team that I feel Van Gaal will play, but I'd like to see something like:
De Gea
Valencia - Carrick - Blackett - Shaw
Blind
Fellaini - Di Maria
Januzaj - Van Persie - Rooney
This formation will see Di Maria going back into his most effective position - left centre midfield, giving him the chance to pick the ball up from deep and drive into the left channel and use his great crossing ability, which would see Rooney cutting in and almost playing a second striker, whilst Januzaj keeps the width on the right. The formation could potentially turn into a 442, looking something like:
De Gea
Valencia - Carrick - Blackett - Shaw
Januzaj - Fellaini - Blind - Di Maria
Rooney
Van Persie
This is similar to how Madrid used Di Maria and Ronaldo last season, and I would want Rooney to adopt the role Ronaldo plays at Madrid, as I feel he'd pick up bags of goals.