Mixing framed artwork in creative ways can be much more interesting than one large framed piece. Odd numbers of framed art create the most pleasing effect. It is important to create some unity in the artwork but make sure to have variety for more character, everything doesn’t have to match.
Themed walls are often a good idea. Grouping a series of family photos or all black and white images in multiple sizes makes a nice presentation.
When your ready to hang the grouping, cut pieces of paper the size of the frames and tape to the wall. You can play with different layouts without making holes all over your walls.
Go ahead, get creative and have fun!