How can I print several specific sizes onto one sheet of paper?

So I made a few small images in fresco that are separate files that I would like to print onto one sheet of paper so I'm not wasting paper. I know I can print actual size if I export it as a pdf, but I don't know how to control where on the page it will be printed at or how to add another image from fresco onto that pdf. Then I tried to print from photoshop and exported the images as psd to photoshop. I was able to control where the image went on the page and it printed the actual size, but I could not find a way to add another one to the same page so they can be printed out together. Can anyone give me instructions to print several fresco images onto ONE sheet of paper, but in the original sizes I made them?