If you're wanting it to look silver, your best bet would probably be to find some edible silver leaf and cover the icing with that.
You may be able to find better help if you post this in the foodies section; there will probably be some professional and ameteur cake decorators in there.
You can get edible metallic sprays and lustre glazes - the cake decorating shop on the gallery level at the markets do them or you could look online
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Bringing chaos out of order
Time is a great healer. Unless it's a rash, then you're better off with ointment.
'Reality', sa molesworth 2, 'is so unspeakably sordid it make me shudder.'
