Design a plastic enclosure look and feel for a new electronic product

We are developing a new media related electronic product and need a plastic enclosure designed. This work does not have to deal with exact CAD/CAM enclosure model. Rather, this job is to design the outer shape/look using a popular free 3D package such as Blender, so that it can be rendered in a marketing video for this product. Attached are some examples we have in mind, but we are fully open for new suggestions. Any design should meet following conditions however: 1. It must look futuristic and elegant and should not be very fancy looking. The target market of this product are higher middle and rich class. 2. It must not be hard to manufacture. Models which are too complex may not work, as the manufacturing cost will be high. 3. We prefer boxed shapes than round shapes, but this is not a huge requirement. 4. This enclosure will contain circuits, a normal hard disk that are used in desktops, a small mother board and power units and so on, so it should have enough space inside. Size should be similar to a typical slim DVD/Bluray player or smaller. But we are open to consider shapes that are different, as long as it can contain the circuits. 5. The device will only have a power button and a power indicator. No displays. 6. We need the same enclosure to give different looks, for example, black, white, polished steel, and may be more. So keep that in mind when designing, as the design should look good for multiple skin types as above. This job consists of proposing a new enclosure design and model it using a free software like blender. We need to see at least 3 verities of looks, as indicated above.