Obviously I don't know where he got his, but here are two places on the web for interesting colored shoe laces. Think the first is having a bit of a father's day discount as well.
Got the electric blue laces from AE. With black shell, I find it an easy way to play with the bright colored laces. Glad my pair inspired something.
Landed overseas and no problem with the metal shank. They set off the alarm but no issues with security.