No one mentioned smoothies?
Huge variety from either yoghourt based, like say, banana and cinnamon with natural yog, or fruit based ones, and really, theres so many varieties, and you can "water" the juice to fruit to make the blend thick, thin, fruity, sweet, sharp or whatever.
Or I have started to get the "pricier" squashes in, like Belvoir Farms blackburry and apple, or winter warming mixed berry which is nice with hot water.
Or even dont forget a good old hot chocolate. Someone mentioned coffee, and yes, once you get into making with milk, adding flavours to it (a sacrilige for some) and getting away from just "coffee", and perhaps experimenting with diffeent blends/beans, theres a whole avenue to go down.