I didn't use PSP since a few years ago, but I'm sure it should be able to do this.
So you have to use the Magic selection tools (it's a tool that selects a region that has small color changes around the point you clicked), and set the sensitivity to the good ratio (the try/retry way is the best to find it), so you can select all the ground without anything more.
On the blue-green cement, it should be quite easy if you do the blue zone, and after the green zone, as each zone as very low color variations.
Once you selected the area you wanted, change the hue, contrast, luminosity until you reach the desired result.
All of this can be done in Photoshop as well.
If you have more questions, I'm there..!
And if you reach a nice result, you can show it and/or share it here..!