Creating Windows XP look building icon

Start by creating Create a rectangle using rectangular shape tool. Press Ctrl+T. Right Click and select perspective. Adjust the nodes to get the shape as shown.

Apply a gradient overlay layer style.

Similarly create the other side.

Create a rectangle using rectangular shape tool. Press Ctrl+T. Right Click and select distort. Adjust the nodes to get the shape of ground as shown below.

Press and hold Alt key and keep pressing down arrow key to create 3D extrusion. Select and merge duplicate layers. Move this layer below all the layers in layer order in layer palette. Change it's color.

Select the building face layer with gradient overlay style. Create it's duplicate and scale down.

Remove the layer style. Enable "subtract from shape area" at the top bar. Create some lines using line tool.

Similarly create some horizontal lines as shown below.

Double click the layer to open layer style window. Apply settings as shown.

Select the building face layer with gradient overlay style. Ctrl+Click the layer thumbnail to get the selection. From select menu select modify>>contract. Contract the selection by a few pixels. Create a new layer and apply a white to transparent gradient. Move this layer above all the layers in layer order in layer palette.

Similarly create the other face of the building as shown.

Create more building with different sizes and colors. Place as shown below.