"Reuse old shoe organizer for paint/art supplies (whatever is useful for you) so you know where everything is," the OP suggested. In the photo, the organizer is full of several types of brushes, tape, ...
If You Only Have One Closet, You Could Seriously Use These 29 Organizers 3w 1. An adjustable closet doubler that does exactly what its name says to help fill that dead space below your hanging tops.