Photo editing - just touch up

I'm looking for an app that will let me simply remove unwanted things in a photo, like a foot that got in the way. I usually use MS Paint for this and use the dropper tool to pick up the color form the photo I want to use as cover up.. I don't know the technical name for this tool, But its really cool and all I'm really looking for

Any suggestions?

Thanks,

Instagram is the best option for image editing, cutting and sharing.

Instagram is the best one for image Editing and sharing. "FotoEditor" and "Photo Slideshow Directory HD" also popular application for Image editing.