Greetings! I noticed one of my three random covers (and the one with the richest amount of elements from which to draw inspiration) matches a submission from another contestant. Was that expected as a possibility? Should I pick from the remaining two? 

I suppose while I'm asking, would blending two covers be an option?

I thought the intent was to use all three together, though the overview says to use "any or all of the material in whatever way you choose." I'm using all three but I expect elements from some covers will stand out more than others. Either way, I think it's very unlikely that your submissions would be the same even if you were given the exact same prompt.