>>> rgb_overlay(labelled_img_stack, original_img_stack);
rgb_overlay.m will add a layer of colour given by a labelled image ontop of an original grayscale image.
imshow3Dfull.m displays 3D grayscale or RGB images in slice by slice fashion with mouse based slice browsing and window and level adjustment control. Original source
text2im.m converts a passed text string to a matrix which contains the the string as an image. Original source