To my knowledge, HDWalls will not skin your top and bottom taskbars correctly on 6.5.x. You will need to make your own. There are 2 PNG files (classicbluesoftkey.png and toptaskbar...png, i can't remember the exact spelling off the top of my head and i'm not at my main comp atm) that you will need to edit and then place in your phones main windows directory with total commander. Once you edit and place the files back on your phone, soft reset and there you go.
EDIT: download
THIS and the two files you need should be in the rar.