I've just been hit with some inspiration:
Get a plastic case, put in the LEDs and fill it with silicone sealant.
I'm thinking that this should protect the circuit enough for it to take a fairly substantial beating.
It wouldn't even need to be spherical, you could use any shape you feel like.
If I ever manage to find somewhere in Wycombe that sells LEDs, I'll make a set and post what happens to it
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Bovril - It's liquid cow y'know
[This message has been edited by TheBovrilMonkey (edited 31 December 2001).]