Use a text widget for both. For the RSS feeds, view the source code of your site in the browser to figure out the URLs for both feeds, the examples from below would work too but they are not permalinks: Put this into the text widget:
<a class="comments-icon" style="float:left" href="http://www.yoursite.com/?feed=comments-rss2" title="
Subscribe to the COMMENTS feed">Comments</a>
<a class="posts-icon" style="float:left" href="http://www.yoursite.com/?feed=rss2" title="
Subscribe to the POSTS feed">Posts</a>
Each link and its image build a unit, you can add margin to them to space them out. I've put the two links into a container with the class "clearfix" because both links are floated, to make sure they don't break out of their container.
I added an inline style of "float: left" to both links because by default they're floated to the right (in the logo area)
For the homepage link use also a text widget and put i.e. something like this into it:
<a style="font-size: 2em; color: #cc0000;" href="/" title="My site">My Site</a>
You could add more inline styles to this link i.e.
<a style="font-size: 2em; font-weight: bold; font-family: georgia, serif; color: #cc0000; text-decoration: underline;" href="/" title="My site">My Site</a>
To link an image:
<a href="/" title="My site"><img src="/wp-content/themes/atahualpa3/images/myimage.gif" alt="My Site, maybe a variation of the title" /></a>