Someone proposed to call it iHolder but it was decided that such name could be too gorish.
Now seriously. I didn't got satisfied with the WC Holder 1.0 (see this link) and I remained wondering how could I improve it.
Then one day I saw a set of methacrylate photo holders as these:
I bought the entire set (about 10 euros in a Carrefour hypermarket) and took the smallest one...
...glued a couple of fridge magnets on it...
...and that's all. No more steps.
The palette of the WC box is also a new version (see the old one on this link). Now I'm using just the 3 basic but unsaturated colors: indigo instead of blue, burnt sienna instead of red and yellow ochre (more exactly quinacridone gold) instead of yellow, all them from Winsor & Newton.
The comparison between the version 1.0 in cardboard and 2.0 in methacrylate needs no further explanations.
For the device at work here are a couple of pictures made by Víctor Martínez "Swasky".