I'm pretty pleased with how they turned out now!
I started by taking down all of the wrapping paper that I'd put up. I found some forgotten border in my closet (some of which is pretty cute) and sectioned off a part of the chalkboard to use as a place to write assignments. We'd stopped at a nearby KMart where I found the colored tape. Now I'll just need to find my chalk holder - I hate the feeling of chalk on my hands!
Then I put up the yellow paper (the type from the big roll in the paper room). I surrounded it by a cute red border with yellow pencils that I'd found at Walmart on one of my shopping trips ($.88).
I finished up with an orange section, again surrounded by a border I'd gotten at Walmart for $.88.
The natives (aka my 5- and 8-year old) were getting restless, so I had to leave the last section of board to finish up next time I go. But I'm much happier with how it looks now, and I can even use the boards with their magnetic capabilities (see the clips attached?).
Many thanks to all of you who commented on my last post with ideas! :)