So - not only recycling to be frugal, but for re-using too :) At the moment, I get my milk in big 2 litre plastic bottles. It's the only organic milk my milkman can get, and as it's fairly local, from just over the border in Somerset, it ticks a lot of boxes. The only bugbear is the plastic, but I do try to re-use as many as I can, which then go on to be recylced when done with. The ones I can't use are taken for recycling too. I use them for the freezer - good for freezing stock and soup, or filled with water and frozen for ice blocks, or just to use up the space to make the freezer run more efficiently.
This is what I'm doing with them at the moment; I cut the bottle into 3 pieces
The top section makes a really good funnel, with a wider opening; coudl also be used for watering pots, eg tomatoes, to get the water direct to the roots without wasting/evaporation. The bottom section makes a handy wee tray - using at the moment for growing cress indoors, but a multitude of uses for them - drip trays, holding wee bits in the greenhouse, soap moulds, paint, all sorts of uses for them. The straight middle section I cut up into plant labels - they last for ages and are re-usable for a couple of seasons at least. After extra usage, all the bits get taken for recycling too, but it's very satisfying to get extra uses out of them before this.