Dark Pads is a nice freebee by Monade Sounds for all Ableton Live users. This collection consists of six Ableton Sampler instruments, all sounds are long one-shot sounds, but also good to use as texture-loops. It’s mainly suited for dark ambient music. If you’re looking for special dark and horror atmos, you should take a closer look right here:

Monade Sounds – Darkpads for Ableton Live