Thank you for the enquiry, assuming the rendered walls are cement based, clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Wethertex AP77 Flexible Smooth Masonry Paint.

This can be mixed to many RAL and BS colours.

The only pebble we can reference would be RAL 7032 Pebble Grey.

We would recommend viewing a RAL colour chart in person to ascertain if this is suitable for your requirements.