The chalkboard technique is a great way to make use of dark-colored cardstock, and created very dramatic images. As the name implies, you make use of pastels (the "chalk") on a dark ground (the "board"). Here's how!
This tutorial uses the Two Step Stamp set, Awash with Flowers from Stampin' Up!. There are two keys to making it work: White Craft Ink and a dark cardstock background. I'm using black, but you can use any other dark color with just as good an effect.
First, start by stamping the solid block stamp from your images using White Craft ink. Here, I'm using the clear mount version of the "Awash with Flowers" set.
Then, using a cotton swab, or a pastel applicator, start coloring the white image with pastels. (You can see below that I was a little sloppy with my stamping, and created a ghost of the petals. However, I discovered that after coloring, you can erase at least most of this. Also, with the second step of the Two-Step Stamping, this error becomes less obvious. Of course, it would be better if I had been more careful inking my stamp.....)
As you color with the pastels, you will create colored dust. Be sure that you pick up your card and shake it off, rather than brush it off with your hand. Believe it or not, that's really all there is to it! You can easily blend colors, as well, which is shown in the series below.
You can stop here if you like, but I love the look of the added outline stamp, Step 2 of the Two-Step Stamping. If you want to line it up perfectly, you can certainly use the Stamp-a-ma-jig (see the tutorial here). But with this technique it's just as fun to freehand the placement.
I used Black Craft ink, and then embossed it to create a glossy contrast to the soft look of the pastels.
While I was playing, I tried a variation on the technique: stamping with Versamark (which is clear), and coloring with mica powders (such as PearlEx Powder, or Perfect Pearls).
See the shimmer in the image above? You can also see a direct comparison of the two approaches in the photo, below.
The yellow flower on the left was done with the more opaque pastels, and on the right, with mica powder. You could also try applying the mica powder on top of the white craft ink.
For more ideas on how to use two-step stamp sets, check out this brief primer here. Try other colors of cardstock, try monochromatic themes, and try using opposites on the color wheel (such as orange chalk against a dark green background) if you REALLY want things to pop. You'll really have fun playing with this, I know!
And keep creating!!