I found a great tutorial to learn how to make galalithe. Galalithe is a milk based polymer also known as "french bakelite". You have to heat some milk and pour a few drops of vinegar , then you filter the mixture, allow to dry a bit for 24 hours, then you can use it and turn it into beads or pendants and leave it dry for 3 days ( or more). You can sand it, saw it, file it, patinate it.
It takes time comparing to polymer clay but it's an organic plastic much better for health and environment ( though I will still use polymer clay, at least the one I still have).