How to Make Aspen Trees

I took some time to document my technique for making aspen trees.  Here it goes:

I bought a bundle of floral material called Gypsophila from Hobby Lobby for $10.  It was simply labeled "bleached gyp".

I start by trimming several small peices from the larger plant with a scissors.  I am trying to make trees that are about 2" tall for my current layout project.  This is a bit small for N scale, however, my layout is small.  For larger layouts, a taller tree may be more appropriate.

In order to get a fuller or more "leafy" tree I found that gluing 2 or 3 peices together at the trunk works well.  Once the glue is dry I spray it with a can of yellow paint.

Here I am applying acrylic white out of a cheap $1 bottle with a small brush to each trunk and branch.  This doesn't have to take long, depending on how meticulous you are.  I then used the end of a paper clip to apply acrylic charcoal to make the dark markings on the bark.

Here is the result:

Aspen Trees?

I am in need of Aspen trees for my current model railroad (among several other types of conifers).  I haven't found any commercially available, so I am attempting to make my own.  I bought some floral material at Hobby Lobby, spray painted the leaves yellow, then hand painted the trunk and branches white and dabbed on charcoal to make the bark.  I'd like to know if anyone else knows of a techique to make a good aspen tree in N scale.  I would appreciate any feedback or comments.