1. Open the window-symbol panel, click the small triangle in the upper right corner, bring up the library of arts and sciences symbols, and recruit a similar symbol to change it yourself;
2. After it is selected, drag it directly to the original symbol panel to create a new "variegated" symbol;
3. Open your background map, add symbols at appropriate positions on the map, select the added symbols, and then right-click and select "Disconnect Symbol";
4. Fill in the corresponding color, or cut the background image with the path of symbol release;
This effect can be achieved by slightly adjusting the details.
However, as said downstairs, it is more convenient in ps, and the general way is to create a new "variegated" brush and then brush it.