I have recently been in several charm swaps. So I thought I would share my ideas.
These I made for a couple of scrabble tile swaps but I did both sets the same or just about. I glued clip art inchies on the tiles (available in the free printable section of my website) then I printed the sayings on velum cut them out and glued them on and stamped them with some swirls Once that was done I covered the entire face of the charm with diamond glaze. When dry I wire wrapped them.
These were for a shrink plastic swap. I made a wire wrapped spiral and then sewed on shrink plastic buttons with metallic tread. Then I glued coins on the opposite side.
This picture is of page pebble charms. I made these last month for the monthly project on my website but as I always do, I made two of each so I would have a set for a swap too. Unfortunately they went missing in the mail. Although I missed the deadline for the intended swap, I still hold hope of getting them back as it has only been two weeks. There is a fee online workshop for the pebble charms ... just click on the link on the right hand sidebar