I also dedicate pipes to blends. Some just seem to find each other. Then I have the next tier, which is pipes dedicated to styles. And I have a small handful of jack-of-all-trades.
Blends that have pipes dedicated to them are Escudo, Anniversary Kake, Barbary Coast, Battleground, Haddo's Delight, LBF, and LNF. I have a pipe that I'm considering dedicating to Royal Yacht and I'm on the lookout for one to dedicate to Capstan Blue.
Then I've got a few pipes dedicated to Aros, to VAs, to VaPers and to flavored VaBurs. Several cobs are dedicated to burleys.
I'm not sure how certain pipes find certain blends. They just seem to. But I've also learned that slight ghosting in a pipe can have a big influence on taste, especially among nuanced blends. So dedicating at least by style seems to make sense if a smoker enjoys a variety of styles of tobacco. But as always with our hobby: to each his own.