I was a partial participant in the earlier swap. By "partial" I mean that I donated strips because I wanted to reduce my stash and I wanted to surprise a few others who were swapping by allowing them to get more than they were planning on getting. Don't know how that part ever panned out, but I was happy to cut up fabric into strips, especially if I had used the fabric in other projects already and I was looking to pass it along.
Here is the link to how that swap was run. In a nutshell, you could specify that your strips be washed or unwashed. You would get the same category that you sent in.
http://www.quiltingboard.com/t-37912-1.htm
This is just an idea that the host of any potential new swap could incorporate.