Here are most if not all icons from the game:
Should be able to preview them there.
3 236 icons in total. Many are in 3 different sizes.
The image number corresponds to the icons id. You can use that in a script if you want.
<img src='rdb://number'> /
To be able to view them in a script place them inside a “container”:
<a href="text://<img src='rdb://3726031'>">clickable-link-here</a>