I work in lighting and optics and do a bit of amateur dramatics in my spare time and I've been given an opportunity to combine my job and my hobby. The wardrobe mistress in my local amdram group needs to design some angel costumes for our next production and wants them to glow with light. (Think of the bedsheets in the Olympic opening ceremony, although she had the idea before she saw that.) I was thinking of doing this using white LEDs with some sort of diffuser/microlens arrangement. Does anybody have any suggestions for a good LED/diffuser arrangement? The light output has to look smooth and even, it mustn't look like a Christmas tree, and the costume needs to be light enough for someone to move in it.