I think a log cabin with very light neutrals/creams on one side and medium tones on the other would make a beautiful quilt. I would also consider doing a curved version like the one in this link:
http://www.hancocks-paducah.com/Item--i-BU-CRLC
If you want, there are lots of different arrangement for long cabins. Here is a link with some possibilities:
http://www.straw.com/equilters/libra...bin_part4.html
Whatever you choose, it will be beautiful! Please post a pic when you finish.