I find the Russian lenses I've got all work pretty well on my A7ii, even the Helios 44-m with a big chunk missing from the front element!
Noise is only a factor with under exposed shots, but weird bokeh & similar issues can be found.
Lenses intended for smaller formats can loose a lot nearer the edges - the Industar 69 fits into that category as it's designed for half frame cameras. It does need a bit of modification to reach infinity focus on a normal LTM adapter.
If you want poor images try some early zooms especially those sold as having fungus or scratches...
Alternatively try removing or inverting elements from common lenses.
Taking the rear group from a 50mm prime will often convert it to a soft focus lens of about 100mm focal length (extra extension will be needed to focus).
Here's an example shot wide open for maximum glow:
by
Mike Kanssen, on Flickr
Closing the aperture gets rid of the glow within a couple of stops.
Using a close up filter as a lens will give you another extreme toy, & projector lenses are also good candidates to play with.