When I was little my old mum (she wasn't so old then) made all of us birthday cakes - there were 7 of us and we all got special cakes every birthday. There were rockets and forts and soccer fields for the boys; Dolly Vardens and flowers and gardens for us girls.
So hunting around I came across these bright and cheerful birthday cakes from Tahli's Treats in Melbourne.
Looking at her facebook page, Tahli makes a lot of the figures and other images using cut out fondant shapes stacked on top of each other to build up the picture. I quite like that method - it's effective for a kids cake. Bright colours, simple shapes.