Here is a very simple, very inexpensive way to add some bloody decor to your party. All you need is a red tablecloth or some type of red fabric and a pair of scissors.
All you need to do is cut your tablecloth to resemble blood drips. There are so many possiblities with this. You could add a black or white tablecloth behind it for a little extra coverage if needed.
This could be a good starting point if you want to designate an area of your party for photo ops for your guests. Attach the blood drip tablecloth to your wall, add a few posters that you can make yourself. Maybe even put a life-size cut out or two by it (make sure you check out our new cut out ideas). There you have an awesome backdrop w/ props included!