One very easy way to stamp outline images without needing to color them in is to stamp them in color. On today's card, I went with one flower image, stamped thrice in a visual triangle, in a raspberry ink that pops right off the white paper.
A tip for these sorts of arrangements...stamp the sentiment first, and then work around it. Also, if you plan on adding embellishments to the stamped image, as I have done here, be careful to make sure the places you will put said embellishments aren't hanging half-off the raised panel. I stamped very carefully so my silver half beads would fit nicely on the raised panel.
I just love the vibrant raspberry with the silver accents. The contrast works well, don't you think?
stamps: Papertrey Doodlie-Do, Keep It Simple: Thank You
ink: Hero Arts raspberry, Memento espresso truffle
paper: Papertrey white
accessories: silver half beads, silver metallic marker, metal ruler, dimensionals