I take mailing my blocks very seriously. This morning I suddenly thought “did I mail mine?”. I was gone in the beginning of the month so out of my routine. I couldn’t remember if my life depended on it but … I couldn’t find it either. Nowhere! OMG. Thought of mailing Sophie to ask whether it is o.k. to make another one and what if I don’t have the same fabric any more. Sigh. Sigh. Sigh. And then I found it. Neatly in a safe place (of course). Kristin in CA, I am so sorry to be so late but just sent my DH to the post-office with it making him stand in the Christmas line. Best wishes!
I hope that the Block Lotto isn’t a cause for panic for anyone ever (even me). I think we all understand what can happen when our usual routine is disrupted. But to answer your question, it would have been perfectly OK to make a replacement block using different fabrics (as long as they followed the guidelines for the month).