OpenVGDB Editor is an in-browser, crowd-sourced editor for the OpenVGDB database. The database available through iNDS is truncated to only include Nintendo DS games.
iNDS utilized the OpenVGDB database to serve icons for ROMs. Unfortunately, while most games are in the database, not all ROMs are included.
You can find the updated iNDS database here by visiting https://inds.nerd.net/editor/openvgdb.sqlite
For iNDS users, visit https://inds.nerd.net/editor/ to take advantage of the database editor. First, search for the game that you would like to add ROM icon support to, then drag-and-drop the ROM into your browser and click submit.