How I cover my sidewalks on Lego road plates

Lego road plates look good in any lego city, but are fairly bland if they are just put down as is without any proper paved sidewalks added to them.
I started out by covering them in light bley 2x2 tiles, but this became time consuming and the minifigs on them would fall over. I then started adding in light bley 2x2 tile with stud in middle so that I could stand up the minifigs on them.
The next step was to use light bley 6x6 tiles to more quickly and easily cover the tiles, but they would pop off all the time and were hard to find in quantity.
I finally decided to use a combination of plate and tile of various colours, because most sidewalks and footpaths have a variety of colours in the real world, and so should the Lego ones.
Here are some photo's of the finished plates

Straight plates using tiles and plates. I can place minfigs, bins, streetlamps etc at various places to give it a more realistic look. There is a 1 stud gap down each side so that the road plates can be joined with others plates.
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Curve plates are built using more of the 6x6 tiles.