This is one of my favorite tips! I use it all the time. I'm consistantly wanting to use text colors that don't show up well enough to read so I came up with this idea.
Read the text in each graphic below for extra information.
Sample the main color of the paper and brush it on a new layer between the paper and the text. Depending on the color and design of your paper and text you may want to not use the main color but choose black or white instead. For the paper below the main tan color works best.
It's important to use a soft edge brush. A hard edge brush will look to harsh. Here is what soft and hard edge brushes look like...
After you brush the color on the layer in between the paper and the text you reduce the opacity to taste in the layers palette until it looks something like this. A common mistake is to reduce the opacity of a different layer. Always make sure the right layer is selected.
You may not like what I think "looks great" and that's ok. Obviously you can do your own thing. Just remember this tip when you are designing your layouts and you wish a certain color font showed up better. Happy scrapping!