As I have written before I often use ESL/ELL materials for my students, as it is an easy way to find simple materials that are age appropriate.
Larry Ferlazzo's website provides a plethora of links to great sites divided by theme. On my most recent visit I was looking for materials to teach reading through cooking activities and I found exactly what I needed. I wish I had checked Larry's site first.
There are over fifty themes to chose from on the website with great links under each and even more themes on Larry's Beginner Page.
More resources are available on his teacher page and I strongly recommend signing up for his blog on your RSS reader.