After running out of ideas, I asked the kids what they would like to have on a little purse. 8yo's suggestion was a highland cow, a suggestion that I initially thought was too difficult to reproduce on such a small scale. I gave it a try though, and managed to at least make it recognisable.
Unable to think of a complementary design for the reverse of the purse, I went for a literal translation and put the back of the cow on the back of the purse!
Happy with the result, I then followed it with a sheep purse. Perhaps we will move on to the rest of the farmyard at a later date.