I know a lot of people aren't a fan of giving a small momento when asking someone to be in your wedding party. Why? I'm not so sure. Don't really care.
For those of us who do like the idea, this is what I'm doing.
Two of my bridesmaid choices live out of state, so I'll send a really nice letter, then have her call me when she gets it and we can talk on the phone. For the ones local, I'll do it in person.