Bridesmaids are the most humble members of the wedding party, I'd say. They'll love any gift you give to them, really. Like sometimes, when I come home at the end of the day, I give my dog a dirty sock to play with and he really loves it. He'll love anything I give him.
I'm not saying your bridesmaids are like that. I'm just saying that they will love to receive presents, like this Bridesmaid T-Shirt.