These are some new curses I came up with based on the 7 deadly sins.
Wrath
When injured you go into a rage and you must attack, although you do have a choice of the target, at the end of the round you can make a Will DC 10+ the total damage taken to come out of the rage. Also, you will never give quarters to an enemy. While in the rage you gain +2 morale bonuses to Strength and Constitution and lose -2 to AC. At 5th level any damage you inflict causes 1 point of bleed. At 10th level your Strength and Constitution bonus changes to +4. At 15th level you gain a +2 bonus to confirm crits.
Greed
With you everything has its price and you must be paid for every item and service, you are often found counting your coins for fun. You gain the floating disk spell as a bonus spell and have a +2 bonus to Appraise checks. At 5th level any pouches, pockets or bags you carry will hold double the normal amount, while on your person or for 5 rounds after being removed. At 10th level you know the exact value of any object. At 15th level you gain analyze dweomer as a bonus spell.
Sloth
You are lazy to the bone and are constantly fatigued, you gain mount and unseen servant as bonus spell. At 5th level you gain a +2 bonus to Will saves that force you to do something. At 10th level you gain teleport as a bonus spell. At 15th level you become immune to exhaustion.
The other sins are pride, lust, envy, and gluttony.
I was also thinking of possible curses based on the seven vitues: chastity, temperance, charity, diligence, patients, kindness, and humility.