Last autumn I had this topic with my 1/2 mix. Once we started it took on a life of its own - largely because an unfeasibly large number of parents were medically qualified. So we had visits from a dentist, doctor (psychiatrist!), cardiac nurse, paramedic, physiotherapist and osteopath.
A great lesson I did early on was naming external body parts. The planning I inherited said I should give the children a body outline each and get them to do a cloze-style name the bits. Yawn. In their topic groups they were given a piece of wallpaper, had to draw round the smallest group member, decorate the body and add as many sticky labels as they could naming parts. There was some kind of points incentive for each part they labelled correctly.
It was a lovely afternoon. They really engaged and worked together. I learnt a lot about the children by watching how they tackled it. I also discovered that the standard year 1 expectation of hand/foot etc was well beneath them as they could already do a lot more.
We also had a good afternoon on the senses where I set up 5 activities and they carouseled round them. My TA had blindfolds on them while they taste lemon segments, cheese and ready salted crisps. I had a wide range of things in paper cases for them to identify by smell. The feely bags, Kims Game and name the sound were independent.
But I started with self portraits. I used the old TES idea of taking an A4 photo of each child, cutting it in half lengthways and then sticking it onto a piece of plain paper. They then had to draw in the missing half. It worked really well, and had the added bonus of knowing who was who by looking at the photo!
Warhol and Picasso (I think) style self portraits also came in somewhere.