When was the last time you changed those shelf liners? Or maybe you don't have any at all. Laying down a fresh nonstick liner will give you an opportunity to take everything out of your cabinets (and put them back in an organized way), and clean the cabinet or drawer so you start out fresh. There are simply so many uses for a non-slip liner.
This is a very simple, straightforward way to upgrade your kitchen, particularly if it's a rental. Really, anyone can do it! Yes, faucets can get pretty pricey, but as Faith wrote here, you can find single-handle faucets for as low as $80, and nicer, high arched faucet spouts for about $150 — a small investment for something you use multiple times a day.
Sliding shelves and organizer inserts go a long way towards making you feel a little more in control of your kitchen.