Do you have Fritz? That one’s a no brainer for creative FX. It does everything from woolly granular clouds to beat-synced modulation, can be (stereo) CV modded up the wazoo AND has a randomize button
Desmodus from Noise Engineering is a wild reverb, also the AK11 “vintage” reverb from Ekssperimental Sounds can get pretty bent
And over the last little while I’ve been experimenting with vocoders, which can get fantastic out-of-the-box results. Ekss Sounds have a nice one, and the Reason vocoder RE (BVX?) is amazing