I think a good idea for RP servers would be just items you would find in your house such as a Window washing script.
How it would work is, when you plant a transparent script it over time gets darkers or changes color ( Depending on color set) Starting from its first color to say darker shade, then onto Brown. When this happens you can then get window washing spray and clean the windows. It would be a good idea for RP servers so that people can make money by washing windows :P
Another Idea I had was food and soem scripts to go with it. Food is self explanatory, you buy food you eat it and you stay normal. You don't eat and your player type swtiches to a slower one till you eat again. Food could be items, and bricks, such as a round 2x2 in diffrent colors for meat and bread, 1x2 flat for cheese, ect. You would also cook food, by putting it on a brick with a flame emmiter. If you leave it on for too long it would start a fire.
Those were just two Ideas I have.