I used an old b&w orthochromatic roll (no date but certainly expired for more than 50 years...) for cheap and it miraculously fitted in my Holga. I could have it developped... I find the result quite interseting.
antmark, dtimonen, b2377, mimimi_sofia, sadiestoker, ecchymoses, adash, koduckgirl, cycliste, rik041, 1122, upsi57, kangiha, mafiosa, why-yu & kekskonstrukt.
These really are very interesting!