I have some new two-color bunnies in the works and I thought it might be a good opportunity to show the process rather than just the end result. This top photo shows the fabric pieces with the pattern marked on the top. I use a plain #2 pencil for light colored fabrics. My favorite tool for dark fabrics is the white Clover marking pen. It does not rub off when you are working, and it disappears the first time you press it with an iron.
After I turn the edges under, I come back with some embroidery to bring out the details. For these blocks, I outlined all the white areas, right up against the edge of the fabric, to give it additional contrast. I have details drawn on the butterfly wings with the white Clover pen. I intend to use clear mono-filament thread to quilt it, adding texture to the wings. I also plan to attach fusible crystals to the butterflies for eyes and wing spots when the quilt is finished.