I hasd a bout of insomnia the other night and stumbled across your tutorial.  Unfortunately Paper quality was an issue so just grabbed the thickest I could find in the drawer.  I used illustrator to design a custom gradient - The paper quality effected the quality of the print and scoring damaged and weakened my paper.  This turned out to be a blessing.  To strengthen and accentuate colour I used gold marbling inks on the mountain folds and gave a quick coating of sparkly mod podge.  I am thrilled, Thank you for the class.  My work even attracted compliments from my highly critical 14 year old.