In the default symbols there is also the Veri-Color symbols. Choosing that will allow you to change the color of your symbols to your selected color. In this case, choosing a black, or dark grey will give you a nice grey Forest symbol which would give you a good 'fake-up' of Web Filled trees.

As to fonts, Any good font website has hundreds of fonts. Also check out this part of the the forum:

http://www.cartographersguild.com//showthread.php?t=743