I usually make a tribute out of my PK's, or in some rare cases I'll even destroy some supremely evil or good piece of gear as a fitting sacrifice (coupled with a brief prayer).
Send up your prayers _without the intent of getting an interaction_. Just do what the char would do.
What do I mean exactly?
Well, with Darascus, unless I was praying in Corrlaan's shrine (where I damn well AM hoping for him to show up...that's the point of a shrine), my occasional prayers were made after killing various opponents or accomplishing tasks. It varies by the nature of the God in question.
If I were praying to an evil God, as an Imperial, I might send up an occasional "The Empire would be ruled far better in my capable hands, Enlilth. If I hadn't already given my soul to it, I'd sell it to you for the chance."
I don't know man, just do what the character would do. Take the *ORB* out of the equation.