Creating an icon in perspective can be easy. Illustrator has a Perspective Grid but in this tutorial, you can create your own grid quite quickly, then build your icon in perspective.
Set up the perspective by drawing two lines, this will be your perspective angle.
Select both lines and choose Object>Blend>Blend Options. Set the Spacing to Specified steps and set the number of lines you want to create.
Then choose Object>Blend> Make to create the lines.
If your lines turn out line string art, this means the lines were going different directions. Double-click on the bottom line and choose Object> Path> Reverse Path Direction to fix this
Select the "fan" of lines and choose Object>Expand. Click OK to expand the lines.
With the lines selected, choose View> Guides> Make Guides. This feature takes any line or shape and turns these into guides. The guides will be locked. To unlock the Guides choose View> Guides> Unlock Guides.
Create shapes that conform to the grid.
When you draw shape start with one corner on the grid.
Use the Direct Selection Tool to select and move the point to snap to the grid. Hold Shift to make the stay in line vertically.
Repeat the Direct Select process with the other points until all the points snap to the grid
Copy the last shape or create a new one, use the Direct Selection Tool to snap to the grid.
Create any lines or shapes that snap to the grid.
Add some color fills.
You can unlock the grid, copy the grid lines and flip them to do the other side of the perspective.
When the corners meet at the convergence point, anything with a stroke will have odd tips showing.
The way to solve this is to select the shapes and change the stroke Corner from square to rounded.
Problem solved, corners now look like they come together cleanly.