Scanners are pretty cool...very quirky. I think it adds to their personality. One thing...if you know you have a scanner and he/she will be sedated at the vet....advise the vet. They tend to freak out when they see a bun coming out from anesthesia that exhibits neurological presentations.
We also had a very unscientific thing on colors. Years and fewer rabbits ago, we would take our buns on a three hour one-way trip to our beach house. At that time, Wal Mart used blue bags. They reacted favorably when they saw the blue bags. But sometimes we went to another chain that used white bags. Even though they got the same treats, they never reacted to the white bags the way they did to the blue. Just one of those things you notice.