All follow the same pattern; lacking variety.
一千篇文章都一个样。指文章公式化。也比喻办事按一个格式，非常机械。
南朝梁·钟嵘《诗品》卷中张公虽复千篇，犹一体耳。”宋·苏轼《答王庠书》今程试文字，千人一律，考官亦厌之。”
The artist's paintings are all qiān piān yī lǜ, so they've become boring.
Learn the next connected idiom: 千篇一律 (qiān piān yī lǜ) → 屡见不鲜 (lǚ jiàn bù xiān)
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