I shoot color jpegs with my GF1. Use Silver Efex Pro and apply a sephia preset. I kind of crush the s-curve to lower the brightest point. Additionally I make the grain a bit finer. After that I apply a preset in Lightroom that has a very mild s-curve and some duo toning with yellow tint for the highlights and more green for the shadows. Just don't worry about noise or whatever. The treatment in combination with the jpegs gives for me pleasing texture.