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Tweetium for Windows 8.1 (Black theme)
Tweetium has a number of themes that can be selected in the app settings. This is one of the nicest black themes.
Tweetium for Windows 8.1 (portrait display)
Tweetium makes great use of the display no matter the orientation as demonstrated in this portrait screen shot.
Tweetium for Windows 8.1 (conversation view)
Tapping any tweet opens a popup showing the selected conversation. The colorful display makes it easy to follow the thread. Tapping the little arrow in the upper right of the popup returns to the timeline.