If only I could get it to work...

I've wanted for a long time to design my own blog background, so I found instructions on the web, and went to work. After spending many hours in Photoshop (probably way more than would've been necessary, if I really knew PS) I created the above background design, based mostly on my own artwork, uploaded it to Flickr, followed the instructions and voila!...nothing. I end up with a plain white background. I'm sure the design will require much tweaking, but I can't tweak what I can't see. After many attempts at fiddling with the html per the instructions, I have given up for now. Maybe I saved the image incorrectly, or something. Any pointers from anyone who knows what they're doing in these matters, would be appreciated. For now, it's back to one of blogger's own backgrounds.

The small logo at center bottom is one I designed for myself years ago, pre-Collagitation. But I do like it, so I incorporated it into the background. In case I never do get the blasted thing working, here's the logo itself, based on my initials: