I needed a small coobblestone scene for a 3 figure vignette, and i made this scene. Because i think that is simple to do, chip and good looking i Will share it with you...
I added a 20mm polystyrene sheet to a 15mm thick wooden base...
When we are doing rectangular scenes we must take care that nothing is perpendicular to anythink...

I dressed the styrofoam with 2mm balsa and left a stair when the scene Will be taller... I drawed the corner of the sidewalk so i know where to leave the balsa taller...

I cutted a piece of 3mm styrofoam with the shape of the sidewalk and i drawed the cobblestone... as you see the lower part of the cobble stone is done, and because the work is the same i Will show how the upper deck is done...

We cut the lines between the stones with a scalpel in a V shape... then we do the lines again with a non sharp pencile... for the lower cobblestone i only cuted 1 line and then done it with the back of the scalpel...

We cut the engraved styrofoam to shape an leave a 1mm space to the balsa. We put some masking tape on the balsa and we are ready to put the acrylic stucco on...

For the stucco i used a ready to use acrylic leveling filler for walls...

I putted on the stucco with a wooden stick, i waited for about 20min so it started to cure... than i started to take away excess wit a wide chip brush... in the end i weaped evrything with a semy wet sponge...

I added a rain gutter from miniart 35530
The cobblestone is ready... for the vignette i Will add a barrel with a indication tabble...

I putted some withe glue on the top of the barrel an slowely added some small rocks (cat toilet rocs)

I have putted some white glue + water (3:1) where i want the debries... i puted some debries on (sand+cat toilet rocks+brick debries)

We turn the scene araund so the overleft of debries goes away... than we remove some rocks that are to big and dont fit... we slowely add proper size rocks...

than we add sam glue and wather (1:1) between the debries so that it not tuch the debries and we spray the whole scene wit minimal amount of sand and some micro rocks...

Et voila...

Al comments and questions wellcome
See you... Bruc