Wallpaper: I have a lot of 4:3 images which I want to display on my 16:9 monitor, but want to keep the setting set to "stretch" - is there a tool out there to add black bars or something to easily make these images widescreen?

via /r/wallpapers http://www.reddit.com/r/wallpapers/comments/2n70pf/i_have_a_lot_of_43_images_which_i_want_to_display/