Nail polish bottle holder

I made this a week or two ago.
I use cheap ~30 cent two-way nail polish bottles from ebay to color my models, but they usualy fall arround in a wooden storage box. Chaos!

These low-profile holders are enough to hold onto the bottles and can be glued together to form a larger grid. (build area aprox. 115x100mm but can be easily adapted for other sizes/grid setups).