Congratulations to Lynn from Nebraska Views - I hope she has lots of fun with those variegated threads. Lynn's name was picked out by the ever trusty online random number selector.
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I just wanted to briefly list all the different threads that people talked about. If there are some brands here you have not heard of - try them - they might surprise you. I list in order of popularity:
Aurifil
Don't forget that Aurifil have threads in lots of different weights of cotton that you can experiment with. I suspect people don't know that they also have a poly made for longarm machines as well as a 100% nylon thread. You can read more about their products here. http://www.aurifil.com/