Finding forms in milk bottles

These bottles are made from HDPE – some are an interesting semi translucent white and others are a solid white. They are soft to cut. The handles surely lend themselves to a lot shapes and uses.

I have looked but have not yet found a satisfactory way to colour this type of plastic without buying dubious paints or pens.

The ‘almost’ rhino shape holds the base of another bottle in its body – perhaps it could be a bath toy/soap dish?

Milk bottle box with lid
milk bottle vehicle
bottle head
bottle fish
bottle elephant side
bottle elephant front
bottle elephant family
strange bottle rhino
Gotta lotta bottle

What can you do with bottles? Considering the reuse of glass and plastic bottles. NB PET bottles have their own section.