Bedding plants are good for a display but I prefer to plant something that keeps on comming and getting bigger every year! I bought some shrubs when they were tiny and now they are really nice, I always like max outcomes from plants, pretty coloured leaves, nice flowers and berries if poss and sometimes evergreen.
I love ferns and have loads of lillies planted, they are great for stunning display and nice smells, I also planted loads of pansy's and they can re seed themselves and come up year after year and can provide flowers all year just about, I also buy petunias as they flower for ages and fill a space with loads of colour, you can buy them as plug plants and then plant them out and you should get a nice display!!!!!!! I also have loads of seeds in our baskets and tubs so I should keep the slugs away, they just love bedding plants!!!! Lastly, I have some wild flower seeds that I also put in containers and they then can be moved around to fill dull gaps...happy gardening!!!!