Divine Favor- All gods watch over any divine magic of their own used. If it furthers the gods ethos, they will add a boon...if it goes against their ethos they will add a bane. This works GREAT for teaching a player about a god during game play. A smart and clever player will figure out quick enough what their god likes, does not like, and does not care about. It's a nice reward for good players, and a hard smack down for bad players.
Magic Item Creation- anyone can do a creation ritual, but you will need mundane items, rare items(monster pats mostly) and the exotic part (the full belly laugh of a blue dragon). Once discovered a ritual is only good for a short time. This not only makes everything treasure...but keeps the party together to make magic items. Good, smart, clever players will combine their efforts to make items. Lone Wolves, bad players and jerks are mostly out of luck.
To use (most) conjure, call, polymorph or creation type magic (my game has a lot of such spells) you need a bit of the substance or creature as a material component...generally a handfull. Good, smart, clever players have little problem here...but it sure smacks down bad players or jerks.
For polymorph...it's possible to loose ones self in the new form and become the creature. This is another thing that good players can use for role play...and bad players get no access.