Hi mate , If you go into any good car body paint shop they will have the colour charts to look at . I love the Renault Williams pearl yellow lol .If you want to do a full respray go buy the paint then find a local "cheap" spray shop and get a price . The ET4 is easy stripped , lots of plastic bits etc , you can do the rubbing down yourself , means when you take it to be painted the guy has to spend less time doing it !=cheaper lol good luck .let us know what colour you pick .
ps edit your heading and add "any ideas on a colour" may help
have a small Ulster Fry on me to help you think lol