Stir together oil and garlic; brush evenly on bread slices. Place bread on a baking sheet.
Bake at 350° for 10 minutes or until lightly toasted.
Stir together cream cheese, blue cheese, and whipping cream until blended. Stir in 1/2 cup walnuts; gently fold in grapes.
Shape cheese mixture into 1 (9-inch) log. Roll log in remaining 1/2 cup walnuts. Serve with crostini.
* 4 ounces port wine cheese, crumbled, may be substituted for blue cheese.
NOTE: To toast walnuts, spread on a baking sheet, and bake at 350°, stirring occasionally, 5 to 10 minutes or until toasted.