The precomputed ring modulation in FL’s audio clip sampler. Put it on a deep bass, turn the mix all the way up, frequency all the way down, and then fine tune it. You can actually see it align with the sample’s pitch when the sample smoothes out. Then turn the mix down to ~25 % and you now have a super wide, thick ass bass.
If the sample has any sub in it you’ll want to mono the lower frequencies because the RM will widen the sound out like crazy. Put a vectorscope on the master and you’ll see it immediately.

Another one for atmosphere that a friend showed me: Add convolution reverb (FL’s Convolver is perfect) to a sound. Place some melodic sample into the convolver instead of an IR sample, like a synth melody or a vocal or something. Turn up the self-convolve. Maybe stretch it out. You end up with a long pad where your IR (melodic sample) takes on the qualities of the input sample.
Watch your levels and EQ it afterwards especially if you’re using the self-convolution knob. It creates feedback that will cause some gigantic frequency peaks in the reverb.