All the videos of slime molds were filmed indoors. Physarum in the wild lives on woodland floors amongst the mosses and fallen tree branches where it feeds of bacteria, fungi and rotting vegetation. It's not difficult to make yourself a 'natural' habitat for your slime and let it go 'free range'.
We had some left over clear sweet jars that were perfect for this - any clear container will work.
Put a layer of damp potting compost in the bottom - this will help keep the humidity high.
Put your slime in the middle - about a tablespoonful of colonised oats is all you need.
We gathered some moss from plant pots and used this to cover up the colony so it stays dark and damp. To encourage the slime to grow out where we want it to, we left a little gap in the middle.
Next to add some wood. Don't go pulling branches of trees, a couple of fallen twigs is all you need. The lichen on this one will make a great food for our slime.
I broke the twig in two and soaked the pieces in water for a couple of minutes before putting them in. I've tried to arrange them to look natural and I'm hoping the slime will climb them.
All we have to do now is put the jar somewhere shady and cool and wait.