You may not have had a response because not many have experience with these species. If you find some interesting, mature stock, the species is secondary to other considerations, but with these trees, for me, it would have to be a really promising specimen.
A lot of trees are rejected because they are difficult to work with (foliage problems with size & texture). Most of these fall into that group - I don't know which kind of fir you are talking about. Some people try the Eastern Red Cedar. You can probably find some in the gallery?
THis will take you to all the Cedars I don't recall if Eastern Red Cedar is a true cedar, but it will be in there anyway because of the name.
I probably wouldnt waste my time with these unless the trunks were extremely impressive. The link may give you some ideas. I am sure you'll find something out there in those woods that strikes your fancy. Just don't go pulling up Eastern White Pine seedlings, 'cause it's going to take a good sized tree to make that foliage work.
As to your other question, deadwood isn't usually very long lived on decidious trees In any case it weathers to grey or white over time, so color really doesn't matter.
Good luck,
Matt