Mosses ?

Do it when she isn't there Gaz........ just clean up properly after!!

 

lol....that would be the hardest part of all the process .......and the most expencive part as well , if she`ll catch you , that means a new blender ; ).
please post some picture if you can , plus apparently the same system is used to grow ferns on walls , worth to try that as well .
I would love myself to grow some maidenhair fern or english native fern , on logs .