Need some creative cake decorating designs?

Why not lead up to it and buy some cloth diapers (cheap ones) and put a napkin ring through them and use them as napkins? I have to say the idea of eating a blue cake is kind of offputting...something about blue food is very unappetizing. I would say think of little things you can do to leave "hints" to the family so by the time you serve the cake everyone will already know. You can go to a dollar store and check out baby items you can leave around or use to serve things to give your family the idea you are expecting. Perhaps buy some inexpensive sippy cups and serve their drinks in that...I don't know...just throwing out some ideas to hopefully inspire some ideas of your own...The cake itself can be a regular cake but maybe something like a stork cake topper or something along those lines. You can go to a cake decorating supply store or craft store and see what they have...there are baby bootie candles, pink & blue plastic diaper pins, baby bottles, etc. that you can arrange on the top of the cake.