wp: beach / relaxing - 1920x1080

hey there.. i´m gonna buy a new tv soon ( PANASONIC TX-P42U10E Full HD 42" Plasma ) and it will be most times connected to my laptop via hdmi (i dont even watch that much tv or have a console for gaming. but watching full hd movies and playing games with it is awesome :P ). So what i´m looking for:

Wallpapers or screensavers:

pictures of a nice beach or some other cool relaxing place in 1920x1080

I´m not sure yet if i can set a second backround in win7 for the external monitor (so the plasma tv) or a second screensaver (so if i´m not active on the other screen for x minutes , the screensaver starts.. but only on the plasma tv). If both isnt possible i guess it should work if i make one big wallpaper out of two different wallpapers. So i have e.g.

|-------------------|-----------------------|
|...........................................|
|..car wallpaper... beach wallpaper..|
|...........................................|
|-------------------|-----------------------|

laptop screen...... plasma tv

Also anybody knows if its possible to have 1680x1050 on the laptop screen but 1920x1080 on the plasma tv? And anybody knows if panasonic sucks with plasmas? LG´s should be awesome but way too expensive.

thx bb