We couldn't resist taking them outdoors though :)
This hack was inspired by quartertone's very awesome magnetised kitchen towel, we fell in love with his idea but also thought that sugru could make it a little bit better by solving the waterproofing and washing issue.
Step 1: Ready, steady...
Magnet* we used: Neodymium magnets - size 10mm x 5mm (1/2" is good)
* We bought strong magnets from our local electronic store, (Maplin in the UK - product code: YA29G) they work really well as they are strong enough to hold the weight of a tea towel. (otherwise you'll might get tea towels sliding down the fridge!)
We also found loads of them on eBay, search for: NEODYMIUM or NdFeB
These magnets from RadioShack should be good too.
Or from K&J Magnetics, this one looks pretty good to me.
Good to know: This hack requires just 1/3 of a mini pack of sugru, so you can do three tea towels at the same time, or you can line up a few other hacks so you don't waste any sugru. For more inspiration and ideas, check out our gallery.