...and here is a Logic Pro track icon for Spark.
Here's how to install icons in Logic:
1. Right click the app icon in Finder and select "Show Package Contents"
2. Navigate to Contents/Resources/Images/Icons and drag the file in there
3. Rename the file using a three-digit number that's not already in use. Example: 135.png
Next time you open Logic you'll see your Spark or SparkLE icon in there.