I am in the middle of making a Baby Shower cake. The pic that I found on the net (sorry I can credit the artist...I have no idea where I found it! 
) It looks like the squares may be fondant. I am trying to do this cake using BC only. Can I ice the cake white, mark the squares, outline and flood them with thinned (with water) BC? I don't really want to fill the squared with stars. If the answer is yes, will the thinned BC still crust?
I don't know about the thinned bc, but you can fill in each square with regular bc and smooth out with a paint brush and go over it with viva paper towel,parchment paper or computer paper to get really smooth. Or just smooth out with the brush and forget smoothing with paper to get a textured feel. Several of our talented CC members use bc to paint on their cakes and it looks really good. I'll look some up and post for you.
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=197313
here is a cake that littlelinda did using bc as painting medium, you could pm her and ask her how she does it.
Duplicate post, please see also:
http://forum.cakecentral.com/cake-decorating-ftopict-441673-.html
HTH
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