For what I’m seeing CGtextures.com is a great texture repository, however the textures seen are not neccesarily seamless off the bat and require modification to be seamless and then square.
I’ve already done it to two textures
And made normalmaps for them (The stripes normal map is made strong on purpose, if you want you would set the nor value to .50 or less)
They weren’t seamless before and now they are. What I do is use PSP 7’s convert selection to seamless pattern feature first, then size it to 512x512 and then use conventional methods to make it seamless without taking a fortune of time. However about the time, these are based on two of the easier textures to do that for. So here they are, I’ve already found use for them myself.