Oh this is exactly the kind of thread I wanted to avoid. But, since you struck a nerve, here's my input:
You must absolutely not under any circumstances hit on anyone from work. Never. Ever. Once you do, there will be loads of trouble. But, every now and again, a person might be right up your alley, be it a legit chemistry thing or a construct of your mind. Thing is, it doesn't matter, as long as outside factors cause you to break, or consider breaking, YOUR OWN RULES. And then, you will constantly be debating what did you say, was it received the way you thought, could you have said anything else or nothing at all, is there a feedback, what kind of feedback it is, whether or not it is important. It's likely to go away eventually but it might not and it may hamper your productivity, interaction ability and it may spark rumors. Those are bad things.
Obviously all of this was told from a personal angle as I'm dealing with a similar issue right now but this thread is not about me nor my feelings. The point is, your coworkers may, possibly, at one point, become more than that. But don't hold your breath. In fact, depending on what kind of person you are, you will be bored of the presence of the same people every day and you will forget any funny ideas and/or you will have to get used to the fact that the level of social interaction in your life will change dramatically.
Another sound advice albeit cheesy is to try and get to know the person you think you like. Since your liking is likely the projection of something else, due to lack of information, by getting to know the person just a bit better should give you a clear idea whether or not to move forward with it.
