"And the Tree Tops theme at 1920x1080 resolution. You can definitely see much more of the background image here. Will have to check the rest of the themes at full resolution."

"The new Tree Tops HD Theme."

"The new Turf HD Theme."

"The new Planets HD Theme. I can only guess that the planet shown will change on a daily basis. I refreshed a number of times, with no changes. My guess is that's Mercury - or maybe Mars?"

"The new Graffiti HD Theme."

"The new Ocean HD Theme. This is a favorite of mine."

"The new Pebbles HD Theme."

"The new Mountains HD Theme."

"And this is the same Beach theme, but at full screen 1920x1080 resolution."

"The new Beach HD Theme."

"The new Desk HD Theme."

"The new Wood HD Theme."

"The Tree theme. Notice that the theme backgrounds show through the Inbox, if you have it set to Priority."

"The Wasabi theme! Go green!"

"The new Themes tab in Gmail, showing new selections for Color Themes, HD Themes and Classic Themes. There is a note at bottom (not shown here) that the HD's marked with * use images from iStockPhoto."