Well, it would have been much easier if I did these in Maya, but I'm well suited to the C4D environment. It's really easy and you do get quite a lot of handy tutorials online that will help you to get through with the HyperNURBS and Wireframe designing (believe me, these are the tough parts of designing, material designing and lighting is a lot simpler). If you are new to 3D modelling, you can check out C4Dcafe and other websites for some really cool plugins and tutorials. These include both animations and still image designing and the important part - rendering.
If you are interested in getting the source files of these models, just send me a mail at email@example.com