Blogger Trick

If you want to get rid of those annoying shadows and borders around blogger images, then follow the next steps (see the difference in the screenshot below):
If you are using the old Blogger interface:

• Go to Dashboard - Design - Template Designer - Advanced - Add CSS - paste the following code - Press enter after the last character of the last line } - Apply to Blog.

If you are using the new Blogger interface:

• Go to Dashboard - Template - Customize - Advanced - Add CSS - paste the following code - Press enter after the last character of the last line } - Apply to Blog.

.post-body img, .post-body .tr-caption-container, .Profile img, .Image img,
.BlogList .item-thumbnail img {
  padding: none !important;
  border: none !important;
  background: none !important;
  -moz-box-shadow: 0px 0px 0px transparent !important;
  -webkit-box-shadow: 0px 0px 0px transparent !important;
  box-shadow: 0px 0px 0px transparent !important;
}

Now your blogger images should appear without any border or shadow. Cheers!

Update:

If the above method doesn't work for you, do the following:

- Go to Blogger's Dashboard > Design (Layout) > Edit HTML
- Thick the "Expand widget templates" checkbox;
- Search (CTRL + F) for the following code: