Labuat is a Spanish site, but speakers of any language can figure out how to use it. You listen to music and then, with your mouse, paint a psychedelic picture. Your process is recorded, and you can email the link to your picture to a teacher or friend for posting on a website or blog.
ELL’s can then describe their artistic creation.
There’s no language-development opportunity in the actual use of the site, but there could be in writing and talking about it.