It is tough to find trees of the right shape and mass to provide real cover for 40k vehicles and fliers. During a quick trip to the local Wally-World (Walmart) I came across the ubiquitous miniature Christmas village snow covered trees. They come in 3 sizes ($0.75, $1.00 and $2.00 each) and several different densities, but they all have some sort of winter theme to them (gold, silver, white or snow covered).
$2 for a Large tree between 9"-10" tall
$1 for a Mid-sized tree between 6"-7" tall
$0.75 for a Small tree between 3"-4" tall
I picked up a couple of each size and a can of Hunter Green Krylon “Dual” primer+paint and sprayed them top-down and bottom-up for full coverage. The results were nothing short of amazing!
With a single can of spray paint I have covered 10 large, 20 medium and 20 small trees. I now have adequate coverage for any sized model on the gaming table. I used a hot melt glue gun to adhere them to 3/4" diameter washers (found at Lowes or Home Depot) for added stability.
Let me know what you think!