I just have to say I've seen plenty of quilts in quilt shows that were no prettier than this one of yours. Don't sell yourself short! I see no reason at all why this one shouldn't be shown. You have great color sense and the design is very appealing. The workmanship looks great, too. In fact, after all you've put into this, showing it is something you should definitely consider.
This is the first post I've seen of yours, and I tried to find the rest of the story. So I found the first one, but I'm not able to find anything about when or where you found the blocks, and I'm curious to know that. In any case, I'm very happy for you that they turned up.