yorik

This plugin allows to place widgets on your sidebars, that fetch the contents of one or more RSS feeds, combine them by date if there is more than one, and display the thumbnail images that are included in the feeds items. You can give the widget any number of feeds, and limit the quantity of images to be displayed.
You can use any kind of RSS feed, but they must contain thumbnails (the plugin will check for, in that order, media:thumbnail tags, or enclosure tags, or, if none of these are found, an img tag inside the feed item description). If you don’t undestand a word of this, just make sure your feed carries thumbnails, otherwise all you’ll see is a “No thumbnail found” text…
You can also use this plugin from your theme templates, to display images lists anywhere else on your blog and you can easily give them a fixed size or a maximum size with CSS styling.

Image Feed Widget

A widget to display imges from RSS feeds such as twitter, flickr or youtube

zackdesign

Please let me know via zackdesign.biz if there’s anything broken in your layouts as a result of moving to Bootstrap HTML.
Image Feeds will work in the plugin providing that they use enclosures. If you want you can change the template provided to suit your feed if necessary, though this should work if enclosures are used correctly.
Please be aware that I’ll only be updating this if I need to. Feel free to come on board and contribute!

RSS Image Widget

This plugin provides you with a widget to display images from a feed. It requires Wordpress' SimplePie include.

Image Feed Widget vs RSS Image Widget