There are lots of options for putting 50 on a cake. Does the person actually want the cake to be the 50, or just have 50 on the cake? I personally like the cakes that have the numbers made from fondant/gumpaste or royal icing and they are standing up on the cake. Is the cake for a man or a woman and is there a theme? That would help us to give you suggestions.
you could. I guess it depends on how much cake you actually need. Or you could just pipe the 50 onto the cake or cut out 50 from fondant or do a FBCT or a CT of 50. OR shape the cakes to look like 50 with out a cake beneath it. The possiblities are endless!
There are lots of options for putting 50 on a cake. Does the person actually want the cake to be the 50, or just have 50 on the cake? I personally like the cakes that have the numbers made from fondant/gumpaste or royal icing and they are standing up on the cake. Is the cake for a man or a woman and is there a theme? That would help us to give you suggestions.
She wants a very large cake and a big 50 on top.
But I would like to give her different options too! (Please not too hard for me 
)
Any pictures would be also appreciated.
My cake I made for my nieces 16th birthday has the 16 made from royal icing. It's in my photos if you want to take a look. It's one of my older cakes so it's toward the bottom of the page. It is a 3 tier cake with a firegirl on it. I liked how it looked with the fondant spirals. I looked at your cakes and it looks like you have done some nice FBCTs! You could do your 50 in a FBCT as merissa suggested. If you look in the galleries under the "Over the Hill cakes, you might get some good ideas also! Good luck. Let us know what you decide to do and be sure to post a picture. If I can help in anyway just send me a pm and I'll do my best. I'm definitely no expert, but willing to share the little that I know! 
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