I am attempting to replicate the Portal Cake - what can I use for frosting/shavings etc etc?

At the moment I have a Chocolate Devil’s Food cake mixture which I plan to use for the cake itself, but I do not know what to use for the frosting, the shaving, or the fruit. I hope to be able to make the stuff myself rather than buy store bought stuff. I also want it to be cheap, but still awesome.

Thanks in advance.