I was checking out the Bizzarria citrus at: http://www.homecitrusgrowers.co.uk/citrusvarieties/bizzarria.html

They are really interesting trees, lovely to look at. So I'm wondering. Can or has anyone ever created an intentional graft chimera like these?

Wow that citrus is awesome. This goes way beyond a variegated variety. This is a true collectors item

I know, they are amazing.

Why not?
I know someone who sells it. But in Europe.

But in Europe.

I'm in the USA.

I know that. That's way I said "But in Europe".
Though I find it impossible to not find one in the US. I've been there a couple of times and you can find whatever you wish for there.
Search the internet and you will surely find it.

So... who has it in Europe? I noticed that Flora Toscana has a citrus aurantium "bizzarria" in their catalog, but it hasn't been available for as long as I can tell, and from the picture shown, I'm not sure it really is a chimera.

http://www.flora-toskana.de/onlineshop2/product_info.php?cPath=229_810&products_id=6436

I remember that someone created chimera hybrids between tomato and black nightshade. They split the buds in half thru the eye.., and made one bud from two different halves. If they shot out and tissues united, a chimera formed.

I haven't heard of more than one graft chimera ever ocurring in the same garden.
I would guess that the only way to possibly try to deliberately create a citrus graft chimera would be to use the micro-propagation methods used to eliminate citrus virusses. In this case you would precisely split the growing points of two different varieties and join the different halves.
However, normal micropropagation is a highly skilled laboratory procedure. Further dissection and propagation would be even more difficult, and even then results would be uncertain. Without any commercial application I don't suppose many labs would be interested in trying.
By the way, is the graft chimera "+Laburnocytisus Adamii" ever seen in the US? Here in England I know of two examples of this very strange laburnum tree. It produces mainly standard yellow Laburnum flowers, but purple Broom flowers in places.

Even then, the existing Citrus graft chimeras are all accidental [?] , so no one is attempting to create them by using particular techniques. Possibly using large chip buds with big eyes, parafilm/buddytape etc and razor blades,( and a few old videotapes of MacGyver), you might be able to try it yourself ? The tomato/nightshade was done years ago, so it was pretty basic. Nowdays there is probably more being done with somatic hybrids, fusing pollen or cells to create chimeras for genetic studies.

They are amazing trees, so I could see a market in reproducing it. I thought most of the Bizarria Citrus were in the Italian gardens which why I said the same garden. Sorry, for the mistake.