Has anyone ever kept exotic butterflies?

Has anyone ever kept exotic butterflies because im looking for some so i can keep them in my greenhouse. If you have what do they eat and what typeas have you kept and where can you get them please help me.

NATURE BOY!

http://www.wwb.co.uk/html/livestock_general.html
that link has some pupae for sale
you could just try looking using google
(or collect caterpillars in your garden )
butterflies do not eat, but they drink - usually nectar (although i believe there are some species that only drink sweat !)
you may be able to grow appropriate plants in your greenhouse or some butterflies will take artificial nectar solution (fructose i think?) - you need really good hygiene if you feed nectar solution, and fungi and bacteria grow very quickly in this solution