One reason for not updating this blog recently is, that I'm confused about the new Blogger templates. I haven't had enough time to dig into the new codes and stuff. I still don't know how to make these background for new templates. Therefor still all my backgrounds are made for Minima template.
If you have a new Blogger template, but wanted to change back to Minima, luckily that's easy. You just had to go to your blog "Design" > "edit HTML" > scroll down and choose "Select Layout Template" > choose "Minima" (first tempalate) > save.
But, if anyone can advice me with new templates, I'd love to learn what to do. Then I could promise new backgrounds for new templates too.
And I must apologize, that I haven't had time to response to any comments or emails. And I'm afraid that until Christmas I'll be to busy to do that. Get back after Christmas, if you still need help or advice. I'm going to delete my email. And I start replying on your requests after Christmas. I know, I'm awful, I hope you understand. ;)
Your blog should look like this. But why it doesn't?
The most typical mistake is, that the template is not Minima, all my backgrounds are designed to work with Minima template. To change the template, go to customize (right upper corner).
Pick the Minima template, it's the first one. With Minima the whole background looks like it should look.
One other quite common mistake with the headers or the buttons is, that there is not transparent background.
The images with transparent background are in .png format, you must remember when you save them to your computer, that you save them in .png format, if you save them as .jpg, the background will be white.
An other thing you must remember with transparent background images, that you don't let Blogger shrink them, make sure you don't have check on "Shrink to fit". I make my headers and buttons right size to fit your blog without shrinking.
I'm not sure if I remembered everything, feel free to ask more, if these instructions don't help.
Edit. This has nothing to do with posting the images. You can post also images in .png format to your blog posts, and then you can choose there any size you like, the background will remain transparent. The right size is only important with the header image and the images you add to your sidebar with image gadget.
I've got many questions of how to cut images from .png format collage sheet. It's sometimes difficult to cut images without getting some pieces of the adjacent images. I have an easy tutorial to show how to do it, but it's on my other blog, I hate to bounce you from blog to blog, but there is no sense of posting same post to different blogs, so if you are interested, you can find the tutorial here.