I will second the idea that 4x5 images can be very beatiful things. Also learning these alt processes is much easier with small negatives.
There is also the possibility of creating images with multiple 4x5 negatives (3 in a row for a 5x12 or 4x15 image, for example).
Another possibility is to use 8x10 or larger litho fim in a homemade box pinhole camera for alt processes. I mean, if one is to go into alternative processes, one might as well start thinking in terms of alternative images!