one of the 5 free books is color cookbook "sweet dreams" by Jean Pare. should be easy to find in kobo shop.
another one was a travel book, they're in the "Free" section of the kobo shop for sure... I deleted the others, sorry. wish i could help more!
Off the wall: you have to open a book, then press the middle icon at the bottom (with 4 lines) to share what you're reading on FB, i think for each book reading shared you get 10 or 20%.
Papillon: you need to share reading 10 times on FB.
NORMALLY you'd get them both OTW and Papillon at the same time, but I am picky about what I "announce" to the world I'm reading hehe. I'd rather my friends see me as a geek for reading a textbook than reading some stupid beach novel by Janet Evanovich LOL that's why I just now completed the Off the wall award.