One thing that irked me when android came out with widgets in 1.5 was that the documentation didn’t include a psd of a 1×1 widget background. I took an existing widget and created a 1×1 sized widget from that. Please feel free to download and use or modify for your applications.
1x1_Widget_Frame_Landscape_2
1x1_Widget_Frame_Portrait_2
UPDATE: Adding 4×2 versions of the background.