How many pictures do I put on my page? I normally do 3 to 4 pictures per page. I have done a lot of little photos and I have done the one photo a page thing. In the end it is a battle of space vs size vs quantity
Printing 4x6 photos is the cheapest you will be able to get anywhere. They are the most common so try to stick with those unless you are rich and don't care about $$ (and if you are rich I will be happy to help you spend some of that $$ you don't seem to care about) I cut up 9 4x6 photos into 3 3/4 squares and made a grid with them. Still trying to figure out what I will be doing with this. Thinking of putting them on a brown paper and throwing some stars or other embellishments in there.
If you want to cut your photo smaller; feel free. Once I cut a picture into a 1x1 square. This was from when photos were 3x5 (now I feel old) and I was still using a film camera without zoom. I cut out all the 'garbage' and kept what I really wanted. DO WHAT FEELS RIGHT. If your layout is screaming for itty bitty photos then go for it. I am headed to bed and tomorrow I NEED to figure out what I am doing with this. The other side of this layout is done I just ran out of brown so I have to buy some then I will post the finished layout