Time to reorder paper. I see that Freestlye has Efke direct positive black and white paper:
http://www.freestylephoto.biz/22242-...-4x5-25-sheets

The description says:

Yes, you can use this paper in a large format camera or pinhole camera and shoot original photographs with no negative involved.

And to further entice me:

The possibilities are endless!

Does anyone here have experience to share using this paper in a pinhole camera? My "regular" paper is Ilford RC grade 2. I'm curious how this compares in terms of exposure and development (I use Ilford PQ). And any other caveats, of course.

Thanks.