A bit of a cheat here as its not really a prop I made so much as a simple modification.
So for the last couple of events I've taken a rawhide candle lantern
with me. It's gorgeous, but had two problems. The first is that it
shines up and utterly ruins night vision if it's held anywhere in front
of you or below your head, and carrying it high is a pain. The second is
it requires being relit every time, a particular pain on the walk back
from conclave with that pitch black ditch.
So, I picked up a
cheap solar one from b&q which also I had two problems. The tacky
looking black plastic top and the fact that it was a big empty space
with a titchy led bulb at the top.
The second, I was looking at various methods such as filling it with
fairy lights (which would be a pain to turn off and on), sticking a real lump
of quartz in it (fuss, also heavy), or diffusing it with tissue around the edges - which made it glow
nicely but made it dim and useless.
Then I realised the solution was
really simple and just a bit of scrunched up tissue paper gives a decent
approximation of a big glowing crystal! The light still came out the sides but hit the 'rock' at the bottom and illuminated it nicely.
So here it is, with my rawhide lantern for comparison (and my burner I use for rituals)