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Are you using CS5? Cause I'm not sure you have "Image> Adjustments> Black and White", on the other versions. I created a new layer and did Image> Apply Image, then I hid the original by clicking on the eye, and went back to the copy, then I did the Image> Adjustments> Black and white. It desaturated only only the copy. Once I got all your steps done, I selected it (dancing ants) and went back to the original piece, The one with the original colors) and did a select Inverse and deleted everything except the the lines. You should be able to fill, color these as you please.