Tilings
It's difficult to pass backgrounds on to others easily because they have to insert them into their folders or documents for themselves. Relatively dark images can be used for folders because titles can still be read but text on an html document may not always be easily read over a dark background so lighter versions of backgrounds need to be used there.
To insert a background into a folder click 'View', 'Customize this Folder', check the 'Choose a background picture' button then use the 'Browse' command.
To insert a background into an html document click 'Format', 'Background', check the box and then use the 'Browse' command.
Here is a table with links to some tilings which you might like to use. I produced them from pictures taken in the area where I live and in my garden. I think they are worth viewing as works of art in their own right.