How to change canvas color of adobe photoshop

You can replace the canvas border color with the foreground color
1.open a file/createa a new file
2.select the paint bucket tool  (G)

paint bucket tool

3.choose the foreground color
4.By pressing shift on keyboard + click on the outside of the canvas

BEFORE

AFTER

Again if you want default color
1.click on foreground color
2.change the values of  R,G,B to 192 each shown in below figure
3. click ok
4.By pressing shift on keyboard + click on the outside of the canvas
you can found the default canvas border color