Country is a general term which brings to mind many different images. Dairies, ranches, farms, sharecroppers; cowboys and homesteaders living in rough territories at the edge of civilization. It means strength, perseverance and practicality. Country is a theme that's very much alive. Whether it's sprucing up a ranch house or giving a little flavor to the window garden, using country themes in gardening is not difficult. It just requires you remember that country recalls a time where people lived off the soil and made do with what was already at hand.
Glass was at a premium in isolated areas, so it often had several uses. The first and most practical use was for food preservation. Use a ribbon matching the color of your plant's flowers and tie it around the neck of a mason jar. Some of the oldest mason jars were not as well made; the imperfections in the glass turned them an aqua blue. Use those as they are--if you can find them. Find a picture of fruit or vegetables, print them out, cut them to size, and use them to line the interior of the jars before you put plants in them. For larger plants, use glass lemonade pitchers with a series of yellow ribbons tied around the handle.
Find a copper pot, remove the handle, file and polish any burrs in the metal, and leave it outside for a few months. The copper will develop a blue-green patina called verdigris which will make for a good country-style plant holder. Take a battered old steel coffee pot such as might have been used for camping and glue a loose weave of hemp rope on it in the shape of a lasso. The type of crockery used on the frontier and by cowboys was called enamelware. It's heavy wrought-iron coated in a thick layer of black and gray speckled enamel. Most of them come with eyelets on the interior for hanging them above campfires. Use them as hanging plant holders. Moderate sized plant holders you could place on the porch or entryway are old tin milking buckets. The key in such plant holders is using everyday items which are still recognizable for their original purpose. For an oversized plant holder large enough to hold most of a garden bed, fill an old claw-foot bathtub up with soil.
Take an orchard fruit crate with the label still intact and line the interior with cardboard on which is pasted print-outs of fruit pictures. This will make an excellent country plant holder. Take an iron-bound whiskey cask, such as were used for waterbutts, saw it in half, and place them on opposite sides of a door for matching holders. Varnished a butterchurn and nail the pole and lid against the interior so the lid is a foot off the base's top. It will look like the plant inside is peaking out.