Have you thought about having personalized tags made? The Original Greeting Tag Company (www.originalgreetingtags.com) can print any image and/or message on a tag that you can hang over the handles of your tote bags or you can make up mylar loot or table favor bags with the tags slipped over the top of the bag itself. It is very easy to assemble and cost effective!
If I were a bridesmaid I would be thrilled to receive a practical gift, rather than a gift all the other bridesmaids will get. My tastes are usually different from everyone else's so I would be thrilled to receive either a gift certificate to my favorite store or something picked out especially for me. Getting something personal (not personalized) and most of all useful, would tell me that you appreciate my friendship and took extra time to choose something just for me.
A friend of mine is using these for her wedding party gifts in October - they even gave her a free one for herself:
I think practical wedding gifts are catching on! These are eco grocery bags - great idea for a 'green wedding', but so cute you could use them as a purse or just a tote for work. All in all I think bags are a great idea! I've gotton a cheap silver box for earings in the past and a cheap picture frame - something I'll like adn use is much better - a girl can never have too many purses or bags!