Let’s admit that a radiator is not usually an interior decoration, unless you can allow yourself a product (expensive, too) of a sophisticated design.
There are indeed situations when it is compulsory to hide a radiator and what to do in such a case? How to hide a radiator? At least in America covers for radiators are so popular that while looking for examples I had to spare a lot of time to select several best ones. The variety of those covers is endlessly big, as one can create different perforation and image. Most usually those covers are made of wood, however, there are also variants made of metal. It is said that wood is the best choice, as it harms less and lets air circulate better. You should also try not to cover a radiator tightly, leave the opportunity to put a cover away, open the door or get to a radiator in another way.
It is possible to use a radiator in various ways: to put a bench, make cabinets, or simply a plane, on which various things will be put or hung. If you don’t want to leave spaces in front, you must necessarily put array from the top and the best way would be to combine to ways.
If still it is not possible to hide a radiator in any way, make it a room focus and specially brighten. The old model radiators are especially applicable to that, as they provide industrial and rustic style mood to a room. Most probably it will develop into a separate topic one day. Be creative!