One thing you should now..

about blogger templates is that all the images and style files inside the xml template file are linked from free web hosting services. Sometimes it happens that those services are off line or overloaded and their servers respond slow, this can lead to incomplete opening of your blog. If you have your own web hosting it`s the best to download all the images of your template placed inside the xml file and upload them to your own hosting. This way you don`t have to worry that next time when you open your blog it will be broken.

ps. This only affects templates uploaded by you not native blogger templates.