Just did one for a friend who did NOT want pink even though it was for a girl. So I got some bright lime green fabric with the words "Girl Bugs" and lady bugs, butterflies, dragonflies, in yellow,white and just a little bit of hot pink, and used darker bright lime green sashing with the bright yellow squares on half and yellow sashing with the green squares on the alternating ones facing the opposite way. If I did another one I would do hot pink piping around the 6" center square before adding the sashing. But it came out really cute anyway. I backed with a lime green flannel & tied it with bright yellow 1/8" satin ribbon tied in tiny bows.
Oh, I'm a Grammy!
Have some cute animal fabric with a more pastel green background that could be either boy or girl.
Have you checked with the moms as to what they want? Some want brights, some have a theme, some want a particular color scheme, and some are just grateful for whatever you do!