I have many herbs growing in pots all around my deck...I also love flowers. I really think it makes my deck look interesting to have many pots growing many things...I have rosemary, basil and mint growing in pots along with petunias and marigolds.
I love sitting outside enjoying the smells and the blooms from my many different plants. Don't forget about hanging basket plants...My husband always grows a few tomatoes in hanging baskets every year...the tomatoes are easier to get to and it is another fun conversational piece. I think next year we are going to try to grow strawberries that way to see if we can beat the slugs.
Here is a recipe that I use every year in my container gardens and you probably have all the ingredients in you home right now!
2 tablespoons black coffee
1/2 cup unflavored gelatin
1/2 teaspoon baby shampoo (or cheap shampoo)
1/2 cup of ammonia
1 gallon of water
1 heaping scoop of compost
Mix together and pour on as needed.