So after seeing some of the amazing art people have produced here I wanted to have a go at editing them myself so using the files generated by falko's tool online I created a web page format that reassembles the disassembled openxcom frames back into an editable image
All that is needed is to copy the tiles (32px by 40px) into the hwp_frames folder and the webpage will combine them into the main div and then by the power of javascript it outputs a saveable image in the lower part of the screen. This is for the Sectopod animation routine at the moment.
Not sure who the original sprite belongs to that I've used in the attached example.
Hope this is of use to people!
Cheers,
SQ