These images were taken with a "Lensbabies" single element lens on modern film and digital SLRs. It has a couple of advantages over the Holga: 35mm and DSLR convenience, plus the ability to tilt and shift the sweet spot of the lens to your liking. I can't get these effects easily (if at all) in Photoshop...
Very cool! Definitely looks like a lot of fun. Just got my first 3 rolls of film back from my holga...given my low percentage of keepers I think I lensbaby would be a cheaper alternative :)