Bst/blu is pretty neat, for solo'in that is

I like the vit-down, stoneskin and cocoon.
Its just fun to play around with i think ...

Also Whm/Brd was kinda cool (did that in a pt a couple of times) i love Army's Paeon II to start with and that gives me plenty of time to enfeeb and buff if it wears. Enfeebs from /Brd don't really stick but regen on everyone is kinda neat to play around with or maybe Sheepfoe Mambo for evasion, or Sword Madrigal for attack acc. or maybe even Herb Pastoral plus Barpoison ^.^
But this isn't a really great sub due to only bein' able to cast one buff on your party and poor chance of landing an enfeeb. But fun to try rather than the regulation Whm/Blm

Ummmm i think thats all i can think of atm ... will ponder a bit more and leave more ramblin'