Nah, the only thing I made myself was the daft punk flag, and that was done through converting an image to the animal-crossing colour scheme then recreating it ingame. (it took like an hour @_e)
The QR codes for the water and some of the other tiles are from here: http://sinreiinfinity.blog33.fc2.com/blog-entry-55.html
But unfortunatley I can't find the source of the path designs, sorry. :c
If you just google "new leaf QR path designs" you should be able to find some others.