This DS homebrew from LiraNuna is a demo demonstrating the ease of use of the DS for blending and creating impressive effects almost effortlessly. According to the dev, this project has actually been in his HDD since Halloween, and it's only now that he's been able to dig it up.
Why is the Halloween bit relevant? Because the graphic you will see in the demo is that of a witch flying on her broomstick. That's theme right there for you. Now, whenever she hovers between the moon, she turns black because, according to LiraNuna, the light from the moon illusions it as such.
There are currently two backgrounds and a sprite for this demo release. Note also that the sprite is set to blend with the first background (the moon) with 0 blending, thus getting the black color. Enjoy!
Download: NDS Blending Demo