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there are some really good books on this. one is called "wild color" i believe...
the main toxic element is the mordant, which is necessary to make the fabric colorfast. mordants are made from aluminum, copper, etc. so the flower or leaf that you use is most likely perfectly safe, but without mordant the color will wash right out of the material, and THERE'S the problem.
it's recommended that you dye outside or in a very well ventilated area.
if interested, i can try to find the exact info on that book.
good luck, have fun.
(ps: softgrey, i think some chemicals are particularly dangerous for birds, even when humans can't detect them...not sure but that's probably the cause for worry)
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