ussally the lights on the walkman 580 go with the colour of the theme, go to the sony erricson website and download some flash themes, most of which contain custom icons with them, if that dosent do it for you i suggest you search for a patch for the light effects, hope this helped you......
and in the theme creator did you edit a theme or create a new one, because if you edited one then it is most likely the theme is telling the phone to use a blue light function....