Anyone have an idea as to what would fit nicely with my Leon? Colour wise, I can't decide :/

Standard, or Raid LED. Anything else would look chav, obviously modified or just out of place.

Rear lights, IMO, should look like they belong on the car and have always been there.
 
Totally agree, thats why i like mine, they just blend into the paintwork, exactly the same colour and reflectiveness as my Black Magic Paintwork.... spot on...

I think the Black/White Standard Style Jobbies might look good on a Silver Leon, cant recall seeing one, but is a possibility. The Chrome Lexus ones 'can' look great, but 'can' look gash, depends if there is anything else, like wheels/exhaust to tie the silver/chrome theme in