I’ve been doing some experiments exposing Ilford HP5 Plus at 3200 for the grain. Here’s a trio for your perusal. You can see they are of flowers, shot on 35mm and close-up using an extension tube. The tendency towards abstraction, and areas of simple tone, emphasises the grain I think.
HP5 Plus exposed at 3200 developed in LC29 for 11 mins
HP5 Plus exposed at 3200 developed in LC29 for 11 mins
HP5 Plus exposed at 3200 developed in LC29 for 11 mins