Press the "D" key to see a drop shadow effect. Press the "O" key to see an outline effect. Use the sliders to play with the distance the drop shadow stamp is from the original sprite and the opacity of the shadow, or to play with width of the outline.
I wanted to play around with and remix a technique I saw Griffpatch mention that creates a drop shadow to give objects depth or creates an outline, both by using the stamp. (I have another project trying this with clones.) See inside to see how it is done.