When arranging photos or pictures on a wall, take the guesswork and "eyeballing" frustration out of the mix with this handy tip!
Trace around the outside of the picture frame onto a piece of paper (newspaper, brown paper, etc.).
Then gently tape each piece of paper to the area on the wall. Walla!
You can arrange and rearrange the paper cutouts until you achieve the look you want!
Source: http://centsationalgirl.com/