I like the coloured sisal coaster, because you can add a perfect matching colour dab to a still environment :)
You can surely colour the previously presented sisal box in the same way.
Links:
Coloured Sisal Coaster (Basteln für Erwachsene – 55 originelle DIY Deko Ideen) (German)
=> scroll to Basteln für Erwachsene – Tassenuntersetzer aus Sisalseil
Here at unikatissima:
Sisal Box