I can't find a good link at the moment, but you can buy tiles made of recycled rubber that are cheap and super-durable. I guess it's the same kind of material you'd find on any playground or track built in the last ~5 years. You can basically just throw them down and they lock together.
Definitely not as nice looking as the other suggestions, but it's cheap and easy.
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"Nitwit! Oddment! Blubber! Tweak!"
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