Seen S1's with the ORIGINAL Grey and Red paint from factory
Mercury Grey certainly stood out, have a pic someplace, will dig it out

Datapost Red S1's, but they differnet anyhow
Seen Mallard Green a couple of years back (Performance Ford feature) looked 'da nuts
Black, leave it to the lovely Princess Diana Original IMO, don't even go there!
Something subtle, but defo NOT Imperial Blue, no way on God's earth!!!
Mallard Green IMO, looks lush