Making Chalkboard Sketches

Do you like to sketch? Easily make your sketches look like black and white chalkboard drawings and/or word art.
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First, I have to admit I figured this out with a "light-bulb" moment while working on some basketball kits I'm designing. I just had to stop to share what I discovered.

Start with sketches on some kind of drawing paper (a paper that will have a bit more texture to it than regular white computer paper) or from a sketch book like I did. And, yes, I used one of my kids pencils.
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Scan your sketches and save on your computer.

Open in Photoshop (for this tutorial I'm using Photoshop CS6).

Click on Image > Adjustments > Desaturate (this just takes color out of the image - but still keeps the file as RGB)
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Then click Image > Adjustments > Invert
This will turn what is white into black - and what is black into white.
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Last click Image > Adjustments > Brightness/Contrast
Play with the brightness and contrast to get the look you want.

Now your background looks like a black chalkboard and your pencil drawing looks like white chalk.

Bonus: even where I smudged the pencil - it looks like white chalk dust

I hope you are as excited about this discovery as I am!

UPDATE regarding colored chalk:
after you've done the initial tutorial - use the wand selection tool and click on a white section.
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Then click on Select > Similar (from the top menu bar).

Make a new layer in the layers panel.

Fill your selection in the new layer with a color.

In the Layers Panel change the layer to Multiply.

Thanks to Lana for this help with anyone using PSE11:
Click Enhance>Adjust Color>Remove Color
Click Layer>New Adjustment Layer>Invert
Click Layer>New Adjustment Layer>Brightness/Contrast

So fun!!!