Many times I want to apply a very small amount of ground foam in a small area.  I've found that using plastic squeeze bottles works well and the bottles don't cost much money.  I get mine at Hobby Lobby and they are $1.99 for a two pack.

Here I'm using the small bottle to add a little turf on the rocks on my waterfall.

Inspiration- The base of an N scale Bachmann tank car. I thought it looked more like a Heavy Duty flat car so it became the following.

Yes I am aware it is upsidedown that is a glitch on the mobile platform.

Info- A paper tube (would have preferred styrene) between to "flatcars" The photos tell the rest,

Model animation—bringing models to life—adds enormously to the interest and enjoyment of any layout or individual model!  In the midst of the self-created kaos of preparing clinics for the 2015 NMRA convention, I snuck in the time to work on this animation of a DCC controlled UH-1H Iroquois helicopter, that I built for a friend. This video captured the project just after I competed all but the final details and decaling, just before it flew off my workbench.  All the sounds are generated by the model as you see it and hear it.