Honey is fun to experiment with since the flavor profile can be different for various types of honey, from floral and light (orange blossom) to dark and spicy (chestnut honey). It's an easy way to introduce another dimension of flavor to classic cocktails.
Imbibe magazine had an article on honey in cocktails a while back.
Elements: Honey (Imbibe)
Honey can be paired with pretty much every base liquor: gin, bourbon, scotch, rum, and even Calvados...
Honey syrup is usually prepared as a 2:1 solution (2 parts honey for 1 part hot water).
The Bee's Knees (gin, lemon juice, honey syrup) may be one of the most famous examples. It's a simple gin sour with honey syrup.
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The Gold Rush: bourbon, lemon juice, honey syrup. The honey syrup, that could be expected to be overly sweet paired with the bourbon, is actually subtle and highlights the spice in the bourbon.
The Brown Derby is similar to the Gold Rush above, but with grapefruit instead of lemon juice. It's even more complex flavor-wise.
Sam Ross' Penicillin uses a honey-ginger syrup as one of its ingredients together with blended scotch, Laphroaig, and lemon juice.
There is also a Calvados drink called the Orchard Keeper (Calvados, white vermouth, honey syrup). Apples and honey is a very nice combo.
The Honeysuckle is basically a daiquiri with honey.
Continuing with rum drinks, honey is a commonly used ingredient in tiki cocktails. Three Dots and a Dash is the first example that comes to mind - it's a really delicious drink with demerara and agricole r(h)ums, allspice dram, falernum, and angostura bitters that is worth checking out.
The Hart of Darkness from Beachbum Berry Remixed pairs honey with passion fruit.
And last but not least, I just remembered that in Saint Lucia the Ti Punch was frequently made with a touch of local honey and some grated nutmeg, which is such a great idea. The local honey is particulary dark and flavorful.
