I discovered a wonderful formula for a great whole grain bread with currants and walnuts recently.  It is in the King Arthur Whole Grain Baking.  It is made with a whole wheat starter and more than half whole wheat.  It is a wonderful sweet bread, and the texture is really nice.  I was impressed at how well the whole grain bread rose with just the starter.  I highly recommend this to anyone.  If anyone is interested, I will try to input the recipe here when I am at home where the book is.  I am now inspired to try some of their other breads.