I need a good project to make use of a number of 3 liter wine bottles.
I once visited a garden in which the owner buried the necks of wine bottles in the ground, allowing the rest of the bottle to stick above ground so the wine bottles could act as decorative edging along a pathway. It took a lot of wine bottles, though, and they were smaller than 3 litres.
You could check out the ideas at the link I'm providing.
Here is a link that might be useful: 4 DIY Ideas for Empty Wine Bottles