Sometimes, it's the simple ideas that are so effective - like this one! If you have multiple pairs of sandals or flip-flops, use some inexpensive magazine holders to store them all in a closest or up on a shelf.
Over-the-door metal shoe rack used for organizing scarves, hats, purses, etc. This was an idea I saw on Pinterest a while back. So I asked for the rack for my birthday so I could tackle the scarf disaster I had going on. Only took me 10 minutes to organize them by length and color. I am so happy with how it turned out!! Thanks to whomever thought of this ingenious idea first!