Expectant mother doesn't like pink

I'm helping to throw a baby shower for my sister. She's having a girl but does not like the color pink at all.

Any ideas for a cute poem or even just something I could write at the bottom of the invite to ask people not to buy pink clothes? I think it's kind of rude to say that but I don't want my sister to get a bunch of stuff she won't use for the baby. Thanks in advance!