I've had this picture saved in my favorites and have been dying to try it. I think it could easily be modified to a martini theme. Obviously, it's not my pic... but I think it's a great idea.
http://cakecentral.com/modules.php?name=coppermine&file=displayimage&meta=favpics&cat=0&pos=-33620
That would be my guess. I definitely haven't seen any shaped pans like this and I think it could be carved from a sheet cake... maybe in two or three seperate pieces... maybe one piece if you're really careful with the stem. I think I would do it in three pieces (top, stem, base) and then cover with fondant.
I'm not sure how big you're making the cake, but I recently used the really big martini glasses (2 ft) that they sell at michaels as a cake stand filled with pink lemonade and then on the cake (2 tiered round) I did l in white with pink swirls and little fondant olives as the border all the way around. I unfortunately forgot my camera and am waiting for my friend to send me pics, but hopefully that helps a little.
I think something like http://www.cakecentral.com/modules/coppermine/albums/userpics/15749/normal_celcake_-_pinkmartiniwm.jpg would be adorable! This is by user antonia74 which I found just doing an image search for martini.
When you click the galleries tab, there's a search button and then you just enter in your keyword 
I have this one saved in my favorites. I cant wait to have an occasion to make one like it....
http://cakecentral.com/modules.php?name=coppermine&file=displayimage&meta=favpics&cat=0&pos=-52016
Cant wait to see what you come up with!!
Hi
here is another image for you to check out.
it is from www.scrumptions.com
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