You're more than welcome to use any of the ones in our 'Been Fishing' section Click Here
If you see one that you like, right click the image and select 'set as background'
Once you've done the picture will form your desktop background. If it doesn't fill your monitor, right click an empty part of your monitor screen, select 'Properties' and in the drop down box under 'Background' select 'Stretch'
Most of the pictures in Been Fishing will open into larger ones once clicked