If you're looking for inspiration for your next tattoo, check the resources available at Illustrated Monthly -- a one-stop shop for artist reference material. The materials are packaged as virtual sketchbooks, available for download in medium and high resolution. The ebooks are are organized by different themes, like lettering, flowers and foliage, pulp imagery and more. Most downloads go for about $2.99 for medium resolution.
Interestingly, for me at least, the copyright notification states: "All the images featured in the galleries are originally the works of artists who, to the best of our knowledge, have been dead for over seventy years, which makes them part of the public domain in many countries. However, laws on copyright being prone to vary from one country to the next, it is advisable that you ensure that the use you intend to make of them agrees with the laws of your own country." They also disclaim any liability, which means that if you find yourself being sued, you can't go after them.
That said, if you're looking for a jumping off point in creating your own personal design, these digital books could be well worth the download.
[Via Tattoo Culture Magazine]