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Currently my friends and I are using a gaming board I made, using 2x2 feet squares of MDF, covered with pool table felt.
It does its job well enough, however it is slightly heavy, does not fit together all too well, and does not look great.

I was wondering about the use of foam floor tiles to create a gaming surface (to place on top of a table).

Something like these: http://www.ebay.co.uk/itm/CHILDRENS-AREA-EVA-JIGSAW-PLAY-MAT-FOAM-PUZZLE-64sqft-/370421324918

They would be lighter than wood, and also inherently connect together.

On top of this I would like to make a cityscape, permanent roads, with spaces left for moveable buildings.

Does anyone have any recommendations or tips for working on foam? ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6755063.page http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6755063.page GMT
Finding one with the proper texture might be tricky - they generally look more like carbon fiber than concrete or asphalt. On the plus side, you can find the same interlocking style sold as anti-fatigue mats for workshops, which generally come in a more suitable charcoal grey color.

Due to the material's inherent flexibility/squishiness, I'd be leery of trying to attach anything directly to the surface, other than equally flexible paint (acrylic/emulsion). Simply painting on roads to establish your city grid (as opposed to gluing down solid curbs/sidewalks) will ensure that nothing lifts when the tiles inevitably flex during handling. If you want to include them, add them to the bases of your modular buildings. Small divots can be torn out of the surface to add a bit of variety, but large craters, barricades, debris, etc. are best individually based as moveable scatter terrain. This also keeps the tiles perfectly flat, which makes for easier storage - just stack them up and toss them anywhere they'll fit.

[edit:] davethepak's store terrain maker probably just used PVA, which is still pretty flexible when cured. Anything that will flex along with the tiles should stay put reasonably well (thin applications of texture paste, flock, static grass, etc.), but solid things (thick layers of glued sand, curbs, building bases, etc.) are liable to lift unless a stiff backer is added to the entire tile or extreme care is taken to never let them bow.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6756495.page http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6756495.page GMT
The guy at the store managed to get a glue that held flocking to them, and even made some extra terrain pieces out of them.

They are very durable.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6758776.page http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6758776.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6759135.page http://www.dakkadakka.com/dakkaforum/posts/preList/591465/6759135.page GMT