I have a few suggestion, you can try them and see:
There is an petal effect on the editor, you can try to use them as fire rain perhaps, just a warning, if you want to delete them, it is almost impossible as they don’t leave any trail on ground when they are placed, so make a copy of your scene and then modify on the copy version mantaining the original:
Here Troteck used it on this pic, second one looks like fire:
Also some of the weird aztec statues from this pic
This cliff looks full of trapped souls ( also ships wrecked gives dark sensations):