What about some more personal talk, why don't you ask your colleagues some general questions , for example.. why your colleagues like or dislike their job, what they find interesting, do they go out, how do they have fun...there are lots of questions that are a great beginning for a conversation.. and the relationship builds gradually. And charisma or beauty and stuff like that have nothing to do with having a relationship with someone. Someone finds someone else pretty, for example, and I don't and vice-versa. The point is in being yourself and interested in people around you, genuinely.