Grid overlay of photos app?

[bjornago]

Gday,

I want to use my Galaxy tab as a template to do some pencil sketching - im looking for an app which can overlay a variable sized grid over my photos on the tablet to help with the sketches - Ive had a pretty good look on the PlayStore and (assuming im not blind) cant find anything that does this (presumably) simple task...

Anyone out there in cyberspace got any suggestions of an app that can help me out?

cheers in advance...