Grate quality soap into a microwaveable jug. I combined some French milk soap and mini tablets collected from posh hotel stays.
Add a little water (start with a tablespoonful, you can always add more if the mixture is too dry) to soften the mix when you heat it, plus a few drops of almond oil and any dried petals or herbs. 30 seconds max in the microwave and it should almost rise or fluff up so give it a quick stir, then add a couple of drops of essential oil. Stir again before pressing into a silicone tartlet mould.
Leave to cool in the fridge for 30 minutes before unmoulding and wrapping in greaseproof paper.
I added dried lavender harvested in the summer to some of mine, they look very rustic so I made some smart birdhouse boxes on the scan n cut to present them in.