Individual hay bales are exceptionally versatile.
You can use them as ceremony seating, or instead of chairs around tables, or as long benches at festivals. Use them here and there to help bring a rustic look to life - they make fab photo backdrops. They're also great for propping up wedding / party direction signs, or creating convenient little side tables for drinks and nibbles. They also look great stacked up to balance table tops for bars or buffets to sit on.