Step 1: Parts and Tools
Vacuum tubes --- I strongly suggest using old broken ones, because there are better uses for the working ones.
Neodymium magnets --- They are stronger then regular magnets and you can buy them in large quantities on ebay for very low price
Hot Glue Gun --- Available at any hardware store
Step 2: Progress
Just glue a magnet to a vacuum tube. You might need to use 2 magnets for heavy ones.
How many magnets would you use for this one???
Step 3: Smile!!!
I hope to see photos of your fridges!
Step 4: Peace!!!