I love Violas, Pansies and Nemesia for a bit of colour in winter. Here I used an old bread tin (with holes punched in the bottom for drainage) for my winter blooms.
I keep all sorts of recyclable containers; an up-cycled food tin is a good "home" for my succulents.
Old garden furniture can make for wonderful planters. I am excited to see the "Forget Me Not" in full bloom in this old chair.
Old telephone directory pages used for a seedling "tray". It's too cold yet but these little guys look rather happy in their little "pot" for now. See more pictures of this kind of container here.