http://assignments.ds106.us/assignments/impressionate-it/

Take a painting, drawing, ceramic or sculpture from history and change the style of it. For example, take a painting from modern day artists and turn it into an Impressionist painting like that of Claude Monet. Or you could take a Grecian urn and change the images on it to make it a scene about people going to a Victorian ball.

I want something like Sunflowers by Claude Monet, Impressionist.

And turn something like:

Kehinde Wiley, Naturalist.
Napoleon Leading the Army Over the Alps, 2005
…into this:

Open up a photo-editing program like GIMP and File -> Open an image.  Play with effects under filter.  For a challenge blur a lot with your individual brush strokes and play with the different hardnesses and opacities of the blurring brush.  Don’t forget about changing the hue and saturation to match that of the colors of the impressionistic flair where the changing light was shown, a new vantage point, everyday subjects, etc.

For something like replacing a Grecian urn image into an image of the present you could create your own in a simple program like paint and then copy the image into GIMP.  Using the selection tool you could draw a line on your new creation and cut and copy it onto a new urn.  Using distorting tools match the curvature of the urn.