I love the smell of alyssum, too. I think it's usually called sweet alyssum. It's an inexpensive annual that you can grow from seed or buy plants. It comes in white, rose, lavender or purple. Since it's very short and spreads a bit, I like to place it at the front edge of the flower beds. I also put it in pots of mixed flowers and let it spill over the side.
Heliotrope smells fantastic, too! Like vanilla. It's a small annual with purple flowers. Some types of verbena have a wonderful scent, too. Verbena is a little like roses, in that some have a great scent and some only look good. Sweet peas smell good, too. Clove pinks. I like the smell of butterfly bush, too, if you have space for a shrub.
Lots of different herbs smell nice, too. I usually have them tucked in with my flowers. I especially love lemon verbena, variegated lemon thyme, basils, pineapple sage and different types of mints. The mints spread like crazy though, so I often have them in pots. There are lots of other types of herbs, too. With herbs, you gently brush your hands up under the leaves, to release the scent. Kind of like petting them, from the bottom up, in a sweeping motion. I think the wonderful scents in a garden are a real treat. When I am weeding, they are one of my rewards, as I move to different areas in the garden. I space them like that.
For pretty, everyone has their favorites. I like to have pansies and cosmos, especially the pink ones, in the garden. The pink ones have such delicate, beautiful foliage. I like all flowers!