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I've seen them repurposed for a few things, before, from wargaming surfaces to sci-fi costume armor. If memory serves, they take paint reasonably well (the EVA foam doesn't melt from aerosols, like polystyrene).
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.
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