We have a 1960's house in a dry location (south UK), with insulated cavity walls, and a cold parquet on concrete floor. The piccy shows the construction I think we have, tho sadly I doubt if we have insulation under the slab, unlike in the pic I found. In winter the floor is very cold - the obvious answer to this is to put down carpet - but have some allergies to dust mites, so that's out.
So, I'm interested in perimeter insulation, to try and keep the slab at a warmer temperature. I'm thinking of using 75mm polyfoam XPS floorboard insulation, from the DPS down below earth level as far as I can bear to dig (say dig 600mm down, footers are about 800mm), glued in place with silicon sealant. It all seems easy so far, but then what should I cover the insulation with ? Something that is brick or soil coloured preferably, and that won't get damaged too easily. I'd also want to cut the insulation & shape the cover top to 45degrees or so, to stop little people walking along it.
Is this a good thing to do ? Any advice appreciated !

Thanks Tony - brick slips, brilliant, definitely look like brick! Might take me a while, but I figure I can work around the house slowly doing it.
The cavity above is filled with glass fibre already, which perversely makes the floor colder as the heating is lower. I intend to do a ir survey next winter to find hot spots in it as I'm pretty sure they didn't fill behind the PVC cladding we have on about 20% of the house.

Pre-formed ridges to assist brickslip placing, I get it ! Then even I could make it look ok. My attempts at repairing a brick garden wall were not that even :-(
Thanks again, Rob