Met with a bride who is doing her colors in lemon/navy blue. Sounds really pretty. Her centerpieces will be lemons as well as other decorations. Does anyone have any photos of lemons or lime on a cake? I was thinking of putting actual lemons on the corners or even raise each tier up a bit and stick them in the space.
I don't know about whole lemons... but I can picture incorporating lemon slices. As in a nice whole circle cut of lemon. Make a fresh cut, pat dry with a paper towel, then sprinkle some white or even a light coating of blue granular sugar on it. Randomly place them on the cake like flowers with like some blueberries to give it a navy color and feel.
Painting with fruit sound neat. Anyway, that's my first idea. 
Oh and I like the idea also of seperating the tiers and putting lemons in between.
Found this, it sounds like the sliced the Oranges then candied them....
http://www.cakes-you-can-bake.com/homemade-four-tier-orange-and-lemon-buttercream-wedding-cake.html
I also liked the one joyfullysweet posted in that first link a lot!
Did you see this one?
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1533816&sub=1533817
Just the first one I found doing a gallery search for 'lemon wedding'
Thanks for posting the links guys! djs-I saw that one which is very cool. I have found a couple with pears on the cake which is stunning but very few using the whole lemon.
Well shoot Jan! I'm sorry.. I seem to always put topics in the wrong category. 
KHalstead, I found it! 
http://www.cakecentral.com/cake-decorating-ftopict-615465-lemon.html
They are awesome cakes!
Here's a thread with lots of cakes with all kinds of lemons:
http://cakecentral.com/cake-decorating-ftopict-615465-.html
HTH
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