How do I get grainy pictures ?

The combination I commonly used for this purpose was Fomapan T800 (which was also sold as Paterson Acupan 800) in R09 1:20. Unfurtonately the T800 is no longer made. Try TRIX in Rodinal 1:10 or R09 1:20, this should give the effect you are looking for, or -- even better -- Forte 400 or Foma 400. The results are tack sharp but VERY grainy.

The small prints caveat is the problem. Your best bet might be to try printing only a small portion of your 35mm negative. You could also use a Minox sub-miniature or half-frame 35mm camera. Or you could try pushing Tri-X in Dektol, but in a small print I fear you would still have finer grain than you are seeking. Finally, you could try to reticulate your film by putting it in a very hot water bath to see if the emulsion would start to crinkle.

I just checked. Moersch Photochemie offers an interesting additive for paper developers, which will produce very grainy looking prints from "normal" negatives. They call it Lith E Check their website for it and the availability. http://www.moersch-photochemie.de/html_deutsch/online_workshop/online_ workshop_l3.htm I have not tried the product, but it sounds interesting. There are some dealers in Germany who will ship Moersch products worldwide, one is Fotoimpex in Berlin.

Reticulation unfortunately is no option with most films today. The emulsion is hardened to an extent where it just does not work.

TriX at 320 in Rodinal 1:25 for 8 minutes.

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Grain the size of golf balls.

If David's advice doesn't suffice, then process the Tri-X normally and then wash in 125 F water. Actually you switch to the high temp water at any time after the developer.

Put your Tri-X into an oven and heat for 24 hours at 150 degrees F. Cool prior to handling it. Develop normally in D-76 or Rodinal. The older the film the better it works.

any older emulsion film in dektol will give you the large grain you are seeking. I process at 75 degrees F and get enormous grain.

I think paper grain is indispensible if you want grainy picture. Use lith developer. I wish I can find a formula for a lith developer (or that developer mentioned earlier)!