I don’t provide the cake as it would be too complicated to meet everyone’s design needs, not to mention the problems arising from allergies but of course, there are lots of cake makers out there that you can use.  Alternatively, there are some supermarket bought cakes that can be great – you just need to look and see if the icing is soft enough to make it smashable or you can make your own – I recommend fresh cream or butter cream icing as having the best squish factor.