Ok, I guess I might as well post these actions here for the general use...

Enclosed are PhotoShop actions for creating custom icons.
They were created by
GasCooker quite a while ago.
You may credit him in your uploads, if you find his actions useful.
Place the file in
\Adobe\Photoshop CS\Presets\Photoshop Actions.
Open Photoshop, click on the Actions palette, click on the options menu for that palette, and select "Load Actions".
Open an ingame image of your building in the game.
The image can be any size, but should somewhat square.
Play the action, save the icon, and you're done...

Import the icon into the ploppable SC4Lot file with iLive's LEProp.