Most of the images used for this collage look like torn from several coloured prints of astrophotographic images to me, printed on a heavy, presumably hand-made paper.
The image below seems to feature a rock texture (which makes sense, since the person is standing on it), and to have been cut with scissors.
You can see the Ben Day dots in some of the prints, but it is unclear if they were part of the original photo or due to the printing process. I assume the former, since they're not visible on all of the prints.
Based on the colours of the images and the fibres, I think they were torn from somewhat older books or even posters.
I guess it will be hard to print paper yourself and get this exact same look, but if you want to print the images yourself, I suggest visiting an art supply store and looking into the heavier deckle-edged sketching papers.
Alternatively you might want to go to thrift stores or second-hand book stores and find books with similar imagery.