My sister taught me this trick a long time ago... It's really simple and half of you probably already know it.
Take a fairly large selection of grass, snow, hair, brick, leaves... Or any other pattern you might want as a background. Bigger the better.
Paste as new image.

Effects>Reflection Effects> Rotating Mirror
Offset = 0
Angle = 0

Then apply the rotating mirror again with angle=90

You now own a seamless background useable on the web, as a background for other pictures, or to flood fill over the yucky leftover bits of things in the background. Annoying relatives, birds, and fences.

Graphics are my bread and butter, but that's a new one on me - great tip thanks *dashes off to try it*:)

Sibyllea - thanks! The Paintshop Pro folks here will enjoy that tip. Since Photoshop doesn't have Rotating Mirrors (I like the sound of that), here's a tutorial from the web for PShoppers (half of whom probably already know this also) ;)


Seamless tiles via Photoshop (http://www.cadtutor.net/dd/photo/seamless/seamless.html)