Great way to make sure it turns out the way you want is to cut paper (i used tissue paper) the size of each frame you have. Then tape them to the wall and you can reposition the paper until you are satisfied and then hang each frame. Also so they dont move use stick-um candle adhesive on the back (just the corners), it wipes off if you ever move them so there is no damage to your walls.
Picture frames on staircase wall: I love this look; unified though with a lot of variation in frame types, some of the items on the wall aren't even pictures.
White Floating Desk with Storage.