So, all the sample generators I posted a couple’a weeks ago - the same guy made a reverb impulse generator - these can be used with the Convolver built-in plugin. These can not only be crafted to be long and lush, but also short and VERY abstract/bizarro. Many values to adjust.
Ryukau also makes some of these available as VST3 and LV2 plugins (which VST3 has become incorporated into the upcoming Renoise update, per the announcement).
Many synths and effects -
Neato!