I know that many of my readers don't drink hard liquor, but for those who do (at least occasionally), I've found a site that offers nifty ideas for cocktails with Scotch, bourbon or rye as their main ingredient. While I like to have a bit of bourbon from time to time, my repertoire of what to mix with it has been rather limited. If you're interested, check out this slide show with recipes from Food & Wine magazine's website.
As an example, try the following variation on a whiskey sour (ah, a drink from my long-ago youth....), made with Tennessee whiskey.
Tennessee Rose (makes one drink):
2 ounces Tennessee whiskey
3 ounces fresh grapefruit juice
3/4 ounce fresh lemon juice
1/4 ounce creme de cassis
1 lemon wedge
Fill a cocktail shaker with ice. Add all of the remaining ingredients except the lemon wedge and rose petals; shake well. Strain into an ice-filled collins glass. Garnish with the lemon wedge