Hi there, we recently purchased a house with really rough and not very aesthetically pleasing outdoor paving tiles. I’d like to cover them up somehow, was wondering if I could just cover with concrete or even render? (Ie just use hand trowel to spread concrete mix or render over the top of them). They are very grey and dreary and I’d like to lighten them up somehow, would prefer not to paint. Thank you!

Pictures below. Please let me know what you think would be a good approach.