I was just thinking the same thing! Thanks for asking the question. I am planning (hoping) to make baby shower cookies next week. I bought the cutest little onesie cookie cutter which came with a texture mat. Can't wait, but I'm kind of nervous too.
Wilton has a product called "White White Icing Color" that you can add to buttercream to make it whiter and it works well. Just re-read ColorBoy's post. Looks like Americolor has a white color as well.