As a reaction to the glut of insect on flower shots I finished with last summer though, here's something that I'd like to produce more of this year:
Nikon D300 + Nikkor 200mm f4 AF @ f/10, 1/640th, ISO 560
A shot of a Butterfly on a Buddleia says nothing more to me than "colourful insect on colourful flower". Once you've seen half a dozen of them, they can become boring record shots. This wolf spider shot though has something different. I guess what I'm saying is that shooting B&W macro allows you to portray aspects of these animals beyond "this insect is colorful".
It only seems to work with some shots though. I tried converting about a dozen old shots to B&W yesterday - only this one seemed to work. I guess it's a matter of working out what will work in B&W and what will not. With this spider shot, I think it's the menace and the undergrowthy feeling it has to it.