Making a WordPress look a little different… (combining header and sidebar)

I have a site that I’d like the wordpress blog to match the site a little better….

The site was designed via GoLive:
https://www.samburuofkenya.org/

and the blog using a MistyLook Theme
https://www.samburuofkenya.org/blog/

Is there a way to have an image the can be shown in the header and sidebar like I have on my main site?

Thanks!!!