For mats I really like this:
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=MDPU0172I have two generic problems with mats.
The first is gluing it onto the board so that it lays flat without bubbles or creases. Spray adhesive works very well to hold it down, but keeping a 4x8 sheet straight and even while you unroll it is a pain.
The second is finishing the edges. Corner molding works well and looks very nice, but adds to the cost.
Lately, I've been flocking boards using two different methods.
The first involves
water-based polyurethane. I buy it in quarts from the home improvement store. I use a small roller to cover the board and spread my flock over it. When the urethane dries, the flock is going nowhere.
The second is all woodland scenics. This is the same method I used when model railroading and it holds up pretty well. I use there premixed glue in a spray bottle. I spray a section and use blended turf flock in a shaker bottle to cover the area. Then I move onto the next. Once the board is covered, I go back and spray the whole thing again.
There's not a lot of difference between the two. The polyurethane is a satin finish, which means it may have some shine to it. Hitting the shiny parts with the Woodlands Scenic glue gets rid of the shine though.
The basic method I use for making a board is:
2" insulation foam cut to size.
Cover foam with cheapest self-adhesive 12"x12" vinyl floor tiles I can find.
Roll on polyurethane.
Apply a few ovals of fine sand randomly.
Apply flock.
Once dry, drybrush sand to resemble dirt or rocky areas.
Apply 2" black duct tape around edges.