Hanafi
The sources give no view for it here.
الزخرفة بغير الذهب والفضة
هل تجوز الزخرفة بغير الذهب والفضة في الأقمشة والخشب وسائر الأمتعة؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
٧ - هَذَا وَتَجُوزُ الزَّخْرَفَةُ بِغَيْرِ الذَّهَبِ وَالْفِضَّةِ فِي الأَْقْمِشَةِ وَالْخَشَبِ وَغَيْرِ ذَلِكَ وَسَائِرِ الأَْمْتِعَةِ مَا لَمْ يَصِل إِلَى دَرَجَةِ الإِْسْرَافِ.
«الموسوعة الفقهية الكويتية» (Kuwait) entry «زخرفة» vol. 23 p. 220
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.