Yeah the colored version is the only one on offer. Feel free to use your B&W image.
At this time, I will not be adding more smilies as the current selection is rarely used.
I lean towards supporting things that are actually used (I don't want the forum to become too cluttered and confusing for new people), which is why I don't jump on every suggestion without first seeing there's demand for it.
I hope that makes sense. While it may be a good idea, I want to implement things that will be used by forum members as a whole -- nothing personal