I agree with KnittingNat. I like the idea of using unusual colors for baby clothing.
There are some interesting colors that you can use if you are willing to use other weight yarns, not just baby weight yarn.
For example, I would knit purples for either sex. Certain greens are interesting. Golds. Creams. Rainbow color combinations.
I get stuck when it comes to cardigans. Have to know the sex to know which side to put the buttonholes! So I stick to pullovers and non-buttoning cardigans.
For example, look at this BABY OUTFIT
...and this THIS OUTFIT
and tell me they aren't just adorable...and NOT THE USUAL pink for girls and blue for boys! These outfits would look adorable on either a girl or a boy IMHO.
And BTW: CONGRATULATIONS
on your forthcoming bundle of joy!