Perhaps you could adapt one of nativity themes:
http://www.cakecentral.com/modules.php?name=coppermine&file=thumbnails&meta=search&type=full&search=nativity
HTH
You could do a cross OR ( and I have to find it in my files so I can make one), there is a cake you make and decorate which uses symbols like you use choc cake to remind us of our sins or how "dark" the world was before the light(Jesus) appeared, the number of candles--I think 3 to denote the Trinity. I think it is was a round cake too to denote his never ending love for us.
I will have to find this. If anyone has it, please post.
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