Forget the limited selection of magnetic paint colors. Instead, you can prime surfaces with Rustoleum Magnetic Primer, then paint on a topcoat in any color you please.
This could be used on kitchen cabinets to provide a magnetic storage surface. Or it can be used under chalkboard paint to create a chalkboard/magnetic message center.
The primer color is a dark charcoal, which makes us think that several coats of light-colored paints will be required to achieve full coverage.
It goes on with a roller like any latex paint. The price (as with most specialty paints, it's not cheap) is about $20 for 32 oz.
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We just used this in our kitchen on a portion of the wall, since we have under the cabinet fridge & freezer. I noticed that it required LOTS of coats before it was acceptably magnetic, but we painted over it with only a couple coats of not too dark paint and it was fine. We're quite happy with the result.
We've been wanting to do a section of magnetic and blackboard paint in our kitchen but haven't gotten around to it yet.
You might also try the site Magically Magnetic (link on my name). They have larger quantities of magnetic primer and it's white. They also sell magnetic picture frames and anything else that you can think of that's magnetic.
I used this to make a magnetic calendar. I think I used about 8 coats before it would hold a magnet, even a reasonably strong one.
I have a bunch of it left that I'll use up, but I think for future projects I might be better off installing a magnetic sheet on the wall or something.