Should I...Follow

Hey, I am a level 34 rogue, and my current professions are engineering(lvl 165ish) and mining (somewhere around 170) and I was wondering if i should change to mining/skining, skining/leatherworking, or go mining/blacksmithing. I'm bored of engineering and it costs too much, and i can't really make anything I find particully useful. Thanks.

for money: mining/skinning indeed
for fun: ..up to you.. but bs is pretty much same as engineering (expensive to lvl and time consuming when you dont do powerlvlling)