Here's some screen shots.
The second screenshot is from Skin Studio which you need to download if you want to build a skin from scratch but you can use a basic skin and change colors like in the first screen shot. Skin Studio is part of WindowBlinds but it doesn't (or didn't for me) download with Windowblinds. I had to download it separately and it can be irritating in that you can't open it if you don't have the latest version (which I didn't just now when I wanted to make a screenshot) and sometimes it will lose part of your skin when you download and install the latest version. But you have full control of a skin (not just colors) if you do make your own.
It's very late here so I am signing off for now. Hope you can get it to work for you.
There is also an excellent forum for all your questions but I am too tired now to look for the link ( a quick perusal of my Fx bookmarks doesn't see it).