make a new layer use the pencil tool to make a cross in the colour of your choice - make it longer than you need in the center use a diffuse setting in the paintbrush to add a dob of 'glow' use the eraser on a diffuse setting (I use the default '45' brush) to erase the cross from step one back a bit to give it feathered edges rotate about 50 degrees or so move into position on your pic! see my gallery for examples of this - eg "Red Monika" or "Magdalena" on page 2-ish by now