Just a few remarks...
General observation: If only the flowers of a certain plant are safe, maybe it should not be in the rabbit-safe garden plants? I consider rabbit-safe to mean that a rabbit can run around in the garden, and occasionally nibble on plants, without being harmed.
Maybe also point out that although many plants are rabbit-safe, they are not necesarily food plants or nutritious. Though flower petals, and the leaves of some, can always be mixed with the regular greens, to give some variety.
Be carefull with sweat pea (the ornamental variety). The seeds of those can be toxic. Not deadly, but if eaten in large amounts, they can cause lathyrism, a nuerological disease.
I'm not sure about Hyssop, I know it is used medicinally, but don't know that I would eat or feed it. You may be thinking of the genus Agastache. Several of the plants in this genus have a common name with "hyssop" in it. The main one I grow (and feed to Hazel) is "Agastache foeniculum", common name is "Giant hyssop or Anise hyssop", though the leaftips of most agastaches are edible. Another, Agastache rupestris, is called "Licorice Mint", though it is not really a mint.
There are many more garden plants that are safe.
Viburnum, Baby's Tears, Ball Fern (Davallia bullata), Salvia (Scarlet sage, Texas sage), Coral Bells (Heucheria), snapdragon, African violet, Miner's Lettuce, Fire weed (willow herb), Camellia... There is a very extensive list of pet-safe plants here: http://www.sniksnak.com/plants.html
. They also list toxic plants.
Need to sort out the "Mints" listing . You list all sorts of herbs there that aren't mint, like all the basils, pineapple sage, lemon thyme and licorice mint, which is an agastache, just like anise hyssop.
Oregano: some varieties are Italian oregano, Greek oregano, golden oregano.
Tarragon: French tarragon, Russian tarragon (mexican, or Texas, tarragon is "Tagetes lucida", a different family).
You could also add blackberry, blackcurrant, redcurrant, huckleberry, apple.