I seem to have lost <buthead tossed old mods> a mod. I had one that showed a coloed ring to match the item in your bag. It made looking for a drop easy. So the square was purple for a purple and so on. I know iam not saying this right. Anyone remmber its name?
If I'm understanding you correctly, I think you're looking for oGlow or similar? It adds a quality coloured border to items in your bags, character frame, mailbox etc.