GEM+ displays a small track-specific photo to indicate the currently selected track. These photos, called 'gempics' by me (at least) come standard in our newer progsets (07/11/2005 - #329: sanluis and newer). But of course, we have a complete collection of gempics for all the tracks. Just download this distribution and unzip it to your GEM Pictures directory (typically C:\Program Files\GPLSecrets\GEM+\Pictures), and you're good to go.
Note: The 'allprogs' complete progset package contains all the gempics, so if you've already downloaded that, you don't need to download this.