Solid silver would make an awesome host. It would look amazing. I don't think it's really any softer than aluminum or copper depending on its purity. Plus it doesn't tarnish all that fast. You might need to polish every two months. That really has me thinking now. I'm going to see if I can find some silver round bar. It would be to make a high power green with two 14500's. Direct press the diode and it would be pretty good.