A toggleable option in the editor to have items 'light up' or something on pages where they can be used might be cool and useful.
You could probably do this with a CSS highlight on the graphic or graphic border of the item. I'll play around with it and see if that is viable.
I was wrong. the inventory images are not specifically labelled enough to allow for that kind of selection via combinators. At least I can't figure out how to make it work. If only we could add an id or class tag to images.