Attached is a cab file which will install the Stock Sprint manila background to your device which will show on all tabs. This is confirmed working with Sense 2.1 and is fully compatible with the HTC Weather Animations and Slide to Unlock. (The rain animation is very fast and does not lag when the wiper blade comes across the screen as this uses the stock manila and not a custom background which will slow down some weather animations).
*Testing was performed on Sprint TP2 running Mr.X Rom v1.6.5 with Sense Manila 2.1/WM 6.5
Enjoy!