I also really like the poisons that cause hallucinations and put the enemy at the bottom of the initiative order. Those are effects I can't get otherwise and they add a lot of flavor. I'm also a huge fan of random effect charts (especially if you're not showing your players the chart, so they will be surprised by what the poison does.)
I would love more of these. Poisons for blindness, deafness, partial or full paralysis sound like fun. Poisons which make the target more flammable or conductive to electricity could give your poison user nice combo moments with an alchemist or mage.