Make Your Own 360 Theme

Ok, so not totally, but you can put any picture you want in the background
of your 360. I'm not sure if you get to pick which blade the picture is on
and if it automatically fades the picture, but here you go:

From The Elderly Gamer:
Stop Press! If you've connected your computer to the 360, have downloaded
windows media connect and can view your pictures in a slideshow. Well you
probably know already you can use any picture as a background for your
xbox360. (well to my shame I hadn't spotted it) Simply select your
favourite piccy thumnail, see the blue button bottom left of the
dashboard? "Apply as background" hee hee happy old man. Ah redemption how
sweet.

"Piccy thumnail"? WTF is that?

Anyway, I'm also going to assume you can connect any USB device with
memory and do the same as long as you can browse the pictures in the 360's
media blade.

Strongbad will own my 360 tonight.