I've made a few. I prefer the actualy cake making process over decorating them. I also am not a fan of icing and flling preferring just a good lemon cake or apple or some such. I also made my own wedding cake as I didn't trust anyone to make it chocolatey or gooey enough. I had choc ganache oozing out of it when cut, dark chocolate orange cake and icing, a really moist sponge, basically just chocolate held in place with a bit of cake
However, for kids I do try to make what they want. They are not professional looking by any means but the kids eat them and I didn't mind the mega chocolate cake thats for sure. He wanted a chocolate cake, I think a choc sponge, choc filling, smarties and kit kats met the requirement
Here are a couple from past years.