leftover test cake

I call this one a "leftover test cake" because we have an order coming up for a recipe we had not tried, so we needed to test it (not short of taste testers in our house) and we had loads of leftover buttercream in all sorts of colours from past cakes... best not to let them go to waste... hence the bad colour combinations...but the kids will eat and test all the same. Chocolate mud cake with buttercream