Blue Lines

Just watching highlights of the English League Cup and Ipswich were playing at home. The pitch was lined in blue not white, never seen that before. I know there is a bit of snow around but the pitch was completely clear.

Anybody ever seen this before.

Never seen blue lines, but I have seen red ones. If it is a first then it's good thinking by Ipswich.

are there any rules regarding this?

Good album. Haven't listened to it in ages.