Bud Dietrich, AIA Push pins, the kind you can get at a sewing / crafts store are the best way to hang these kinds of pennants. I get the push pins with the little, round heads in an assortment of color so that I can match the pin color to the pennant color.
"This wall of pennants is in a teenage boy's bedroom — the family makes the rounds of all the baseball stadiums together," says Bud Dietrich, a Florida architect and fellow Houzz contributor. All the pennants were picked up on their baseball park travels.
This idea is pure genius. I have had pennants. My children have had pennants. Now it is my grandchildren's turn. i will make sure my daughter sees this. It does not have to cover the entire wall for it to work.