On my recent trip, I saw spike watering cups, various pots, seeds, and wind chimes. In other areas of the store, I found glassware that could be used for flower arrangements and terrariums.
Also, foam wreath forms and blocks used in flower arranging.
As well as wire wreath forms, florist tape and raffia.
These little Buddha statues could look nice out in the garden or in a container for decoration.
Colorful pinwheels can add interest, especially to fill in bare areas or in containers. My kids gave me one of these for Mother's Day in a gardening gift basket. I have it in a pot of flowers on my deck. It's spins when the wind blows, adding visual interest and color.
If you are gardening on a budget, do check out Dollar Tree. This is just a sampling of what I've seen on their shelves. In the spring, I have seen many more items, including gladiolus bulbs, garden gloves, watering cans, hand tools, and bags of soil.