Um...

Don't some of the guys use old (aka recycled) pkug-in limbs from Xmas trees as conifer-type trees? One 'surplus'd tree would yield many trees of various sizes, and they are wire-trunked so posable, and could be glued into smaller bases cut with a hole saw.

A way to make the deciduous trees is the 'hairspray & dried-leaf-fragments/expired spice/whatever onna twig' method, but if ya want a fuller tree, try the lichen bits poked onto the twigs. If you only have the main trunk, get some wire, wrap it around the 'trunk' to make branches to impale the lichen on. If you canna find lichen, I've seen that they make an expanded-foam bush-substance that looks a lot like lichen.

The pine/spruce/whatever-type trees are easiest from the Xmas-salvage, but if you want leafy-fluffy trees, you're probably gonna have to work at it. Then again, if you SO is into flower arranging, mebbe she can help ya out (or the local womens club?)

WhiteWolf (a tad frantic as his portable HDD warranty expired ~yesterday~ by manufacture, not on the 24th by purchase!)