The colors of the searches indicate how many results were generated by a specific search term. Green is positive and signals over 25 results, yellow indicates 1-24 results, and red means there were no results matching the keyword used.
If you hover on a search in Company Media you can see if there’s any content in the Pickit Stock libary matching that specific search, as you can choose to add images from the Pickit library to your own. If you click on the word you can select to “Search in Pickit Stock” and you’ll get a pop-up with the available images that you can either click to import or drag & drop to your collections.