Yes, Hysteresis and Fracture are so fun to use! Whenever I want to make/experiment with random sounds I just take those two, and go nuts ?
I also liked Soundspot Nebula, especially its LFO and Flanger/Chorus modules. It was on sale in Pluginboutique a while back just for a dollar, but I didn't opt to buy it, so I only got to try the demo. But it's a cool plugin
I also love to play around with saturation (Halcyon from Soundspot too, the free Softube one, which is also included in Cakewalk, as well as the Tube Saturator ProChannel module and others); and distortion (the free FuzzPlus from Audio Damage).
There's a few others, but I can't remember for now ?.