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I've been trying to get on there since the official release of Yosemite without any succes. I hope to get an solution. In the mean time you can download the images on your iPhone or iPad and open them on your MacBook.
 
I tried a couple a weeks ago and it was down. Just tried again, it's still down. I hope they're not gone for good 🙁 BTW, I'm still on Mavericks and my browser is Chrome)
 
When I acces it on my iPhone or my moms Windows 8.1 lenovo laptop it loads straightaway. Don't think it's down.
 
I have been having on and off problem accessing InterfaceLIFT for the last two weeks now. I have a feeling that they might be having stability issues because more and more people are needing the bigger wallpapers everyday and a LOT of us are there every single day.
 
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