SCAMPER is a technique which helps you to innovate on a product or service that already exists by looking at it through different lenses. There are seven different lenses:
Substitute
Combine
Adapt
Modify/Magnify/Minify
Put to another use
Eliminate
Rearrange
You can find a good set of guiding questions for each lense here.
Here's an example of using the SCAMPER technique on a spoon.
This example applies the SCAMPER technique to a KitKat bar:
Substitute chocolate flavour with milk
Combine fruit /peanut flavour
Adapt inside an ice cream
Modify and make it bigger
Put to another use to make a drink
Eliminate and keep to a single bar
Rearrange, cut to pieces for bite-size delights
Source