Are you referring to European "city lights"? These are typically 8-watt bulbs residing in the headlamp housing that give off a subtle glow that is noticeable enough for safety but not obnoxious like the American daytime running light debacle.
If youre looking for a ready-made solution I dont know of one yet. There are universal kits available in which you drill into the housing to install a grommet and bulb. Because the PT uses the 9005/9006 headlights, the easier-to-install H4 city light ring kit doesnt work. See
http://www.rapidparts.com/Pages/vwc020p.html
The look is cool! Check out late model Jags and VW Golfs to see it.