As Heaven previously mentioned, just about everything we use today has some form of origin in paganism. From the calendar months to days of the week to funeral flowers to wedding rings to bonfires, to money itself.
Some things are not practical to stop using due to their origins BUT I can clearly see the point made.
It's like shopping at Wal-Mart whose owners are Christian or some form thereof, and eating at In-N-Out Burger whose owner was a born-again Christian and initially used the business to spread the Gospel.
It's an interesting subject for sure.
Scripture says money is not bad but 'love' of money is. And early Christians definitely used money with insignia and idols on it.
I'm not defending the WTS, far, far from it, but there are just some things that cannot be avoided like money without causing a significant hardship.