I made these for fun last night and wonder if they would sell at a market or for parties. I haven't seen anyone sell something similar in the UK. These were just plain genoise sponge with chocolate buttercream (and looked a bit like white bread with chocolate spread!) but I think a darker coloured sponge would look good. I've seen cute hello kitty ones and other characters online and they seem like they could be a nice alternative to customised cupcakes. What do you think?