I've dabbled in making my own alcoholic infusions over the years. Pretty basic, add some stuff to a neutral alcohol (vodka is probably most common) & let the added 'stuff' infuse its flavor to the liquid.
I've made Limoncello & some sort of damson plum one a long time ago. My most recent (& current fave) is tea - put some quality loose leaf tea in some vodka (I typically use Costco brand) & let it set for an hour or so. Strain out & you have a tea flavored drink. Mix w/ some simple syrup & either mint or lemon & you have an ice-tini.
Any other ideas/suggestions?