Make your own Theme for Windows 8

You can save screenshots in Windows 8 to a specially-created folder inside your Pictures folder, by simply holding down the Windows key and pressing 'Print Screen' (PrtScrn), and then after you've saved several, your can create your own Theme for Windows 8.......

Create a folder named DesktopBackground, and put that into another folder which you have named for your new theme. Put your set of saved screenshots into the DesktopBackground folder inside your new theme's folder. Then go to C:\Windows\Resources\Themes and drag & drop your newly named theme folder into Themes. Click your new theme folder to open it, click again on the DesktopBackground folder inside it, select all of the enclosed images, and then
right-click on one of those and choose 'Set as desktop background'.

Your new theme appears on your desktop. Right-click on your desktop and from the drop-down choose the bottom item, 'Personalize'. That opens the Themes folder and you can then find your new theme in the upper left corner of those shown. Give it a name, and down below the window, click on the icon for Desktop Background. Choose the length of time you want each image to be displayed on the screen, click 'Save changes' and close the window. Enjoy your new theme.