Nature

There are decorations that can be found anywhere and don't cost a penny, cones for example. I collect nice ones on walks and carry them home. Dry and clean I could just tie thread around the lower end and hang them up. For a bit of variety they can be brushed with PVA glue (or even eggwhite) and dipped into a bowl of glitter and left to dry. Spraycans of gold or silver colour or fake snow are also a good idea - lay the cones on newspaper and get spraying. Simple.
 For that "forest flavour" I sometimes drip pine essential oil onto them.