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I might be coming around to the idea of random stones around the edge too.
I know exactly what you mean. No offence to anyone who has this sort of setup, but it always looks a bit fake to me and I only like it if the whole this is sharp and crisp.
One thing you could do is if you have longer thin slabs is to make a mud mortar and then try and get mosses and mini ferns to grow out of them. Iirc for moss you want to find a load and coarsely chop it up, then mix with water compost and a bit of milk or yogurt. Then paint it on.
Thanks for the tips. The liner is probably 30/40cm wider than the pond itself with turf on top, which I hope will go some way to stop it sliding in on itself.
I’ll probably go with packing more earth on top at the edges, and I might be coming around to the idea of random stones around the edge too.