You can also post on craigs list that you need plants, a lot of people will let you come and get stuff like lamb's ear, hosta and ivy from there garden. I posted a couple of weeks ago, myself because I was too lazy to get out there and thin out my stuff myself
Also if you have a childs wagon that is broke or a wheelbarrow that is no longer good, use these to put in your yard to add whimsy to your garden.
I have even put up an old bike with a basket on it leaning against a tree with flowers in the basket.
Pick up those colorful kids wheelbarrows at yardsales or $$ store and plant cheap flowers in them.
I also pick up one of those pink grocery cart (like kids play with) and stuck a flower pot with daisys in it. Looks really cute.
I have also 2 sets of plastic rake, shovel and hoe (one small set and one big set) in different colors leaning up agaisnt by fence in my flower garden.
You can add more than just flowers and plants and it looks unique and one of a kind!