Is it maybe called "Its under the stairs"? That had a blueish/purply cover and some synth work mixed with sfx..

If so, it's actually been discontinued, but some of the tracks on it found their way onto the new release called TEEMING. Check out departedstudios.com. Heres the link: Welcome to Departed Studios - Halloween Music, Scary Haunt Sound Effects FX CDs

Good luck in your search.