If you want a powerful hallucigen that is legal,
try Salvia Divinorum.
It's only illegal in a few places,
such as Louisiana and Australia.
It works on 4 out of 5 people.
It will give you more vivid hallucinations than LSD.
The effects are mostly gone in 5 minutes.
The 'community' takes it very seriously as a spiritual tool
and I've read reports of people using it to quit alcohol.
It was discovered in the Oaxaca region of the Yucatan Penisula in Mexico,
where it is used by Shamans, for religious purposes.
Some places charge up to $40 a gram for the extract
but you can get it cheap here:
I drew this kaleidescope with my mouse, while under the influence: