I love edible flowers too. Only trouble is, when I serve them to many others, they pick them tenderly out because "they're so pretty." Pretty and delicious, dears!
Like Papa, I love roses in all kinds of things (my wedding cake had an edible garnish of drifts of rose petals!). Lavender... I've made lavender ice cream, and I'm also very fond of doing up a sort of pastry tart with lavender-seasoned apples or pears or peaches -- mm.
Any sort of violet-y thing is good, and lovely in spring salad -- wild violets, the johnnies, or pansies. Also great on cakes or chocolates, of course.
Chive blossoms, ripped into their individual florets, are a marvellous savoury garnish.
Nasturtiums likewise -- spicy!
Unopened or half-opened day lily buds are great too. They're a bit more substantial than most flowers, with a sweet green flavour, excellent in salad, or dropped into a light soup in the last few moments.
Oh -- and leave us not forget the elderflower -- fresh, in elderflower fritters or pancakes. Dried, they give a beautiful elusive perfume to a quick simple white cake. I just make sure they're free of stems, and throw a couple of tablespoons right in.
Sweet woodruff blossoms are very pretty, and of course have that wonderful vanilla flavour, but I find that they're best used as a garnish, and strained out of anything they're actually meant to flavour; they have a strangely "hairy" quality.