Mystique appears to briefly take on the shape of a scale model of the Statue of Liberty. It's not a full on-screen tranformation, however - you only see the statue's eyes turn yellow.
Mystique tries to fool Wolverine by impersonating Storm.
Female shapeshifter Mystique takes on several male shapes in the movie: Agent Henry Gyrich, Bobby "Iceman" Drake, a police boat captain, Wolverine and Senator Robert Kelly. The only on-screen transformations (all reversions to Mystique's true shape) involve Gyrich, Iceman and Wolverine, however.