Having had my 40th birthday in April, I wanted to keep the cards together - normally I keep favourite's in a box, but this time I wanted to make a little album of them, so I gathered them all up, in odd sizes and then hole punched twice and threaded some gorgeous red ribbon through them. (I received 2 birthday atcs so I stuck a piece of cardboard onto one side of them so I could still read who made them)
If you have clip rings you could use these, but I didn't so used ribbon.

Have now decided to put all my swaps from the card groups that I am in, in their own yearly albums.........