Do you have a big empty wall but not a large art piece to dress it up with?
Gather all your framed photos, posters and pictures. Stick to a color pallet to avoid visual chaos. If you are doing all black and white art, maybe paint the frames in different colors. If your art is in different colors, stick to one color frames. Measure out the wall area that you are planning to use for your collage. Measure out the same size on the floor and start laying out your pictures within that area. Play around with different configurations to se what you like best. Make templets of the frames out of Newspapers and tape it to the wall. Be careful leaving to much space between the frames or even putting to close together. I find that leaving about 2” between the frames tends to work best. You want the collage to feel like one art piece, not like a wallpaper.
If you are brave and want to make the collage look even more interesting mix in 3 dimensional objects to ad some visual interest. You can also incorporate a clock or a mirror. Start with larger pieces in the center and work your way out. It looks great to mix in one round item with all the frames just to brake up the shapes.
Below are some different examples of bad and good collages, you be the judge! IKEA have a great selection on frames if you need to ad on to what you already have.
PS. The secret to make the pictures look straight is to use a LEVEL + hang each picture on 2 nails instead of one.
There are a few ways to make your collage look easy on the eye.
Work with your pictures within a large square or rectangle. Another way is to have a invisible line go through the middle of the collage and work your way up and down from it. You can also keep the line on the bottom if you are hanging the pictures above a bed, dresser or a sofa. Se pictures below:
When making a collage going up a staircase keep in mind to mimic the staircase lines in your collage. Also make sure to measure on every second or third step the distance from the collage to the stair to make sure it has the same distance consistently.