Again a wonderful idea: stamp little polymer clay tiles, cure, dye and afterwards sand away dye excesses.
In principle it’s the same as my carved candle holder, only there I pressed polymer clay into the crease and cured it a second time.
I think that dye is more ‘sand-friendly’ ;-))
Links:
Fill-Ins with Polymer Clay and Paint
Here at unikatissima:
Carving Polymer Clay