Love this first technique from Jennifer McGuire called patchwork stamping, I can see a lot of uses for it.
I felt a bit more comfortable with this one, we had to follow one of the sketches, I followed Jennifer's, but instead of a banner I stamped the sentiment in a hat.
This next card is from Day 7 inspired by Julie Ebersole, It was using big stamps. I like it even though it's cute, I think the Tim Holtz cityscape gives it a little more grunt??
This last card also from Day 7 inspired by Kristina Werner is just pure masking using border stamps.
looks really effective.