I just bought a bunch of those magnetic knife holders. Mainly they are for my kitchen, but I am using one at my desk. Paper clips are pretty cool to keep notes there. Take a look.
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Magnetic Knife Holder for your Office
About the Author
Linux User, Hobby Programmer and Computer Science Student at the TU Munich. 
where can one buy that exact model magnetic holder?
It is this one: http://www.ikea.com/us/en/catalog/products/00136621/