Go to the Grey Mane Inn in Chorrol. Some guy there wil lask you to go to a farm and help his boys fend off critters. The reward is the blade, Chillrend.
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"You’ve put up a good fight, but I’m through playing. Now I’m going to kick your [censored] and tell of my glory under the next full moon. Die well.”
Lol this is the first side quest i ever did... its pretty good and the blade is pretty pwnage but its better early game as its stength isnt that great and you eventually find other frost enchanted blades....
as far as other coloured glass i dont think there is.... but that would be cool (i think next eldar scrolls you should be able to customize weapons from previous ones by mixing designs or adding symbols etc... like the debaser and chorrol shield)