To blend two objects, click the Blend tool, and drag from the first object to the other object.
Hold down Alt to draw a freehand path for the blend.
To adjust the distance and color progression of the blend simultaneously, move the slider.
To adjust either the color, or the distance, double-click the slider and move one handle at a time.
To change the color of the start object, drag a color from the color palette.
You can use the Blend tool to create a 3D effect.