How about a psionics theme:
Pride - mind over matter, the ability to endure what others dish out and act like its nothing
Wrath - I like the idea of a power that simply escalates things, fire burns hotter, blows hit stronger, sounds become deafening
Lust - Rather than the sex route, an ability to mess with people's inhibitions, you WANT your boss's new sports car, why don't you go and take it! Why should you have to guard this entrance? No one comes this way anyways so go take a nap!
Sloth - Telekinesis, why think of something better when this works, why get up to get a drink, why move at all?
Envy - psychometry, the ability to read objects, maybe gain skills through them. Use a master's paintbrush to have their talents for the arts, or some old sword from ancient times for something more lethal
Greed - probability manipulation, a real gambler always cheats
Gluttony - absorption, taking on the qualities of things around you and applying them to your aura. borrow the sharpness of your enemy's blade and give yourself a sharp quality? maybe something less conceptual and just absorb the heat of things and freeze people like cryokinesis
alternatively, you could just mix it up in a different way. Sloth originally had nothing to do with laziness but was more of discouragement. The sin was discouraging others from cultivating their personal relationship with God. That was confusing to the peasantry though so I guess it changed over time.