Lemon Lime and Bitters is great with any clear hard alcohol. Use 7up or Sprite with Vodka for example, add lemon and lime juices and some bitters. Very refreshing.
Off the top of my head, you should be good for gimlets, sours, and modified versions of the martini (pick up a bottle of dry vermouth for the real thing). The rum should pair nicely with the lime juice and the simple syrup.
I think this search engine might work for you to find other drinks.
Had 1800 Pomegranate & Regular Margaritas the other day, better than any other pre-mixed marg I can remember having. Still a little syrup heavy, alc light but it was expected.
In need of a Negroni
My friend gave me a bottle of pure maple syrup for Christmas this year. I am not huge on sugary breakfasts, so much as I appreciated the gift (and fuck me is the stuff delicious) I just hadn't found much a use for it. Then I bought a decent bottle of bourbon that was a bit harsh and decided to try to make a maple syrup old fashioned. You guys, this is the real deal.
1 shot decent bourbon/whiskey
1/2 shot pure maple syrup
3-4 dashes angostura bitters
Mix all in a shaker with ice. Shake and strain into a glass. Drink a shit ton of them.
Whew that sounds good.
Ods, say it mysterious like Roger More.
Any of y'all who subscribe to Vinyl Me, Please ever tried one of the cocktails included? In their last email blast they had the cocktail for the Nina Simone record, and I happened to have almost every ingredient. I whipped one up tonight and it's really tasty. I'm gonna have to go back and try some of the others now.
1.5oz Bourbon .5oz Dark Rum 2.0oz of Milk .75oz Simple Syrup 1 dash of Vanilla Extract
Add all ingredients to a cocktail shaker, fill with ice. Shake vigorously until shaker frosts up. Strain and pour into chilled Old Fashioned Glass. Garnish with dusting of freshly grated nutmeg.