People who commemorate the Day of the Dead aren’t the only ones occasionally preoccupied with bones, skeletons, and earthly remains. Some Tibetan Buddhists and some Hindus use or wear skull malas to more deeply contemplate death and impermanence. I found this on a website called LuckyMojo.com:

Among the people of India and neighboring regions, the skull necklace is an iconographic ‘memento mori’ worn by certain gods and goddesses, most notably Siva in his ascetic form and Kali in her wrathful form. Skull necklaces are also worn by the wrathful aspects of allied Tibetan and Nepalese deities such as Kurukulla, and necklaces and prayer beads carved from animal or human bones in the form of skulls are popular with their devotees.

There are many skull prayer beads and malas available on Ebay.com right now.