I usually scrap 8.5x11 ( or I flip it and do 11x8.5). I do some 12x12's depending on how many pictures I am using.
I bought three 4x6 cheapy albums today. They are more like brag books. I am going to start doing those too. I sometimes have just one picture that I really want to get the memory down for, but I dont want to do a whole 8.5x11 of it. I will crop the pics to smaller than 4x6, put down an embellishment and some journaling and call it done. I am REALLY excited about it. I have got probably 2000 pictures sitting here waiting to be scrapped for the kids and this will take a lot of the pressure off.