I love 
washi tape.  It's so cute and inexpensive that its so hard not to keep buying rolls and rolls. Finding cute magnets is also difficult.  I usually like to keep my fridge clean with minimal things on it, but since I had kids, their artwork is all over the fridge.  To help keep it cut I made these up cycled washi tape magnets using old magnet mailers.  Speaking of keeping your fridge clean, the I found the best stainless steel cleaner.  My mother in law gave me a box of these 
stainless steel wipes (possibly as a hint that my fridge was filled with fingerprints) that work so well.  I've tried to get the fingerprints and scratch marks off my refrigerator for a while.  After using these wipes the fingerprints are gone and the scratches are much less noticeable.  Sorry to get off on a tangent, here's the tut:
 
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| Tape over old magnetic mailer. | 
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| Washi tape thin to I went back and peeled off the writing off the magnet. | 
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| Cover the entire magnet. | 
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| Cut the strips using craft knife and ruler. | 
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| Zig zag the edges with a scissor.  The more random the cuts the better. | 
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| My fridge is so cute now.  I should really bring these to my work to stick on my cubicle file cabinets. | 
If you have lots of magnets you could also make a 
magnet photo collage or 
magnetic paper dolls.