Above sample by Sue4stampin
This is a technique created by Melissa McCarthy http://melstampz.blogspot.com/ , but you may also have seen it on Technique Junkies www.techniquejunkies.com/ .
1. Stamp a background stamp with VersaMark on light color cardstock (I used white) and Emboss with clear powder.
2. Wipe the card with an embossing buddy.
3. Stamp a line image (such as the flower) in a dark color ink over the background and emboss with clear powder.
4. Fill in your colors with dye ink and a water brush or a wet paint brush.
Note: You can use markers for small more dominant colors.