Here is one of the best 3D Themes out there, it is called Fractal and is an original theme developed by Nokia itself.  This Blue theme mixes perfectly with applications and has a good coontrast overall. A really cool 3D Theme that deserves a try. To install just click the link below with your Nokia E71, or download to computer and install with PC Suite or by transfering to device memor.

Fractal for E71