Received a couple PM's about the WB background, so here's how I did it.
Note this is for the Weather Bug Elite Widget only.
Copy /data/app/com.aws.android.elite.zip from the phone to the PC.
Open com.aws.android.elite.zip with WinZip, 7zip, etc.
The two image files in com.aws.android.elite.zip file to edit are widget_230_100.png and widget_forecast_ls_bg.png.
Extract those two files, change them to your liking, (or use the ones I attached) and drag them back into the com.aws.android.elite.zip
Upload the modified com.aws.android.elite.zip back to /data/app/
If you have the Elite widget on your home screen, deleted it and re-add it. It should be black now.