A quick, low-cost way to disguise an ugly radiator is to paint it in the same colour as the wall behind it. Make sure your radiator is clean before you start, so that you get a smooth finish – our guide to how to clean a radiator can help with this.
Use a metal primer first, then cover with solvent-based paint. Once it has been painted, allow it to fully dry before you turn the radiator back on. Wilko sells a selection of specialist radiator paints.