I came across a set of free, high-quality stock images for touch gestures and I thought I should share the link with everyone. The pack includes 9 gestures – each at around 800x1000px – all rolled up into one PSD file, nicely layered and ready for use in your projects. You can find the download link on this page at www.octaveoctave.com.
As their license states: you are free to Share, to copy, distribute and transmit the work to Remix — to adapt the work to make commercial use of the work. Multitouch gesture for devices by Octave & Octave is licensed under a Creative Commons Attribution 3.0 Unported License. Permissions beyond the scope of this license may be available at www.octaveoctave.com.