I'm still frantically working on everything, but I figured I really needed to post samples of what I had so far so I could get some feedback in the meantime. The first two images are letterhead examples. The last image is a business card. The background color I'm using is Pantone Warm Gray 9 U, although the colors look a little funky since I uploaded these images as a mixture of CMYK and RGB.
Like I said, still working on different options, and I hope to post more very soon, including the envelope.