Playing around with gstreamer

[punkypogo]

Hi there,

I'm playing with my Touchpad and saw that gstreamer is used to play media.
palmvideosink is the gst plugin used for video output, but I can't help making it display something.
Does anyone know which specific parameters do I have to give it to work?

Here is the typical pipeline I'm trying:
gst-launch videotestsrc ! palmvideosink

Thanks in advance.