What you will need:
LOTS of scrap glossy paper (mags etc.)
Lot and Lots of Patience!!!
First lightly make a rough sketch of your picture on the poster board
Next start cutting strips of paper into long 1/4 inch wide strips, Then cut the strips at different angles so that you have 1/4 pieces that are not square.
Keep the different colors separated
Now you can start gluing the tiny bits of paper to your poster board using the glue stick. This is the tedious part. I worked on the Starry Night on an off for about 4 years!!!
After you have finished gluing all your pieces down cover the whole thing with Mod Podge so that you don't lose little bits here and there.
Frame and Hang!!!!
*The last two photos are the same concept with much bigger pieces