I've been terribly remiss and failed to post publicly with the cake I made for my Mum's 60th. Posting from mobile, so please forgive image sizing problems.
So without further ado (or, indeed a recipe - it's sponge cake and buttercream) here it is:
Make sure to use a gel colour in cake batter. Liquids are just not vibrant enough and can change the flovour of the cake in large quantities.
The diamonds on the top are jelly rather than hard sugar. That way you get a lovely clear look, rather than opaque and crumbly.
Posted via LjBeetle