You can change the folder image to another static image of your choice by using the Get Info window.
For example, click once on your HD icon & go to Get Info. In the Get Info window, click once on your HD image (top left) & then select Copy under Edit.
Now click once on a folder icon & go to Get Info. In the Get Info window, click once on the folder image (top left) & then select Paste under Edit. Now the folder icon has been replaced with a HD icon.
This is just an example & you can change it back. I tried to copy an animated gif file & do the same, but it wouldn't work. You can make a small icon image of your choice & replace the folder icon image. I copied the TS mad smiley gif icon & changed it to a mad.jpg & then replaced the folder icon with the mad icon. You could do the same for your Income Tax folder.