One of my favorite graphic organizers is called a Sense Chart. With Sense Charts, students organize information according to one of the five senses. I like to use this graphic organizer when watching video clips of different cultural celebrations (Día de los Muertos, La Navidad, etc). I think it helps to put students in the mindset that they are actually there and makes them think about more than just what they are seeing, but some of the things a video can't cover directly - like what they might smell or touch.
Another useful graphic organizer is the Describing Wheel. I have found this one to be particularly successful with my Spanish I students when we work on describing people. They write the name of a person in the center of the wheel, then within the spokes they write information about that person (age, physical appearance, personality, job, clothing, likes & dislikes etc). Once they have some ideas it is usually much easier for them to begin writing or talking about the person. This year my students did a family project and this was a good way to get them thinking about what they might want to say.
Here is a link to the Family Project we did in class:
The classic Venn Diagram is very versatile. This can also be used to compare and contrast the celebration of holidays in the U.S. with similar celebrations in Spanish-speaking countries. We also use it to compare and contrast characters in readings or even each other!
Here is a link to a website with free Graphic Organizers in Spanish: