Open a folder containing pictures.
Right Click> the background.
(In the drop down menu)
Click> 'Customize This Folder'
Click> The Tab 'Customize'
(Under 'What kind of folder do you want')
By clicking the little down arrow, to the right of the scroll bar. You'll see a list of options. Pick...
'Photo Album (Best for fewer files)'
If you have sub-folders (folders within folders) and you wish them to have the same format also?
Check the box 'Also apply this template to all sub folders'
Go to the bottom of the page and Click> 'Apply' then Click> 'Ok'