Pins and Brooches
Pin findings are pretty cool and versatile. Here are some of the ones I use.
Small lapel pins

These are similar to flat bed stud findings where you can glue charms onto the flat bed of the pin. You can then poke them through the lapel of a tired jacket to sharpen it up!
Pin Findings

Like the lapel pins you can glue these onto different charms. They are a little larger than lapel pins so you can attach larger charms to them.
Here is a pin finding tutorial
Charm loop scarf pins

These pins include charm loops that you can attach beads and charms to. Perfect for closing chunky scarves and sweaters.