Step by step DIY radiator covers at This Old House. Definitely going to need to build some of these. Those radiators are hideous!
Just towels- could use pvc pipe, spray painted. This copper pipe towel rack would work well in a small space. The copper does not react with water.
TBT tube radiator by Ludovica & Roberto Palomba
Eskimo Outline Horizontal 430 x brushed steel
Bisque Flow Form Small Diameter 130 x 1000 Radiator
The Radiator Company Halo Low Level Radiator in White Cast Iron Radiators - Period Radiators, Traditional Radiators, Designer Radiators, Contemporary Radiators, Modern Radiators UK