On a recent trip to Brighton / UK I could observe this photographer (Lomokev) shooting shoes and legs.
He choose a very low point of view by plaing the camera on the ground, using a right angle viewfinder to compose and focus the subject. Equipment he used was a
Canon 5 D
with a 50 mm f/1.4 Canon lens
and a Canon Angle Viewfinder C.
The results of this technique can be seen here . . .
and here with other subjects . . .
Hope you enjoy plaing with this technique; of course a angle viewfinder is only an option and not a must.