Here is a cool eye-catching 404 error page template with Sunflowers background. You can customize the layered PSD file the way you want. This can be used on your blog.
Format: PSD (high quality)
Works With: Photoshop (all versions)
404 text in two variations
Font Used: Segoe UI
Size: 9.49 MB
Instructions: Unzip the file and open the PSD with Photoshop. You're welcome to make any changes. Finally Flatten the Image and Save as Jpeg.