Trick or Treat Halloween Wallpaper Pack is a nice Halloween theme from Microsoft. For something a little scarier, check out Ticket to Fear Halloween Wallpaper Pack.

It's a fun theme that isn't over the top with blood and guts but rather focuses more on pumpkins, spooky houses, scarecrows, cand, etce. So, pumpkins. The artwork is very nice, as always and it's a great theme if you're looking for something artistic without all the gore.

I counted 5 pictures total (see screenshots below) so it's a small download and your slideshow timer is probably set to 10 minutes, which should be perfect for this.

To install simply double-click on the TrickOrTreat.themepack