very little, as a rule i charge cost of paint plus postage plus a tenner if its an engine cover (bit more if its gotta be done in 2 colours), and generally a fiverish for badges/inserts. depends on an individual basis. For the silver and black badges you can see i'd charge 15 quid posted for example, for a specialist colour where i'll have to spend loads on a mixed touch up etc it'd be around the 25 quid
As for the handles i found vauxhall star silver a nice colour. Its impossible to match though as the renault silver is matt, adn any matt silver means it cant be laquered and tehrefore willc hip like buggery