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You can be absolutely certain that the porcelain tiles beneath the raised beds will be a different colour should you ever move them. The porcelain shouldn't crack, so long as it was laid correctly on flexible adhesive, if it wasn't it will eventually crack anyway. Drainage may prove a problem as without downwards drainage the beds may well turn into a marsh in a wet period.
ColinTheBald
I'm in the middle of having the garden done. We've had knotweed historically, so dug down then laid membrane with concrete and porcelain slabs over the top of most of it - except a small pond and a couple of large beds away from the affected area.
I'm looking for ways to make it a bit more wildlife friendly, so was thinking of installing a few raised beds over the top of the porcelain: basically sleeper-based boxes with hardware cloth, landscape cloth and gravel for a base, then soil.
Can anyone think of potential issues putting these on top of the porcelain? They're on a 5-6" concrete slab so I don't think they'll crack, though I'm assuming they might discolour with run-off over time? (Can't see us removing them once in, but you never know