I've been using (and recommending) a utility named Hexplorer and its "pixel view" for visualization purposes. Finally got fed up with its awful UI and decided to write a utility solely for this purpose.
Win32 binary and source (Lazarus + FPC

) attached.
The exe needs to be placed to a writable location as it will save its .ini file there. In addition to Windows, it does work on current Wine (I actually developed it on Wine).
I hope that the UI is straightforward enough.
The features are rather basic. It is meant to be fed with a RAM dump.
https://www.virustotal.com/en/file/f31ec6c8513ca469a54d72890092d05883ecb4aa45aa59ad65bc8715f0e99827/analysis/1451938940/
Update 2018-07-08
- Low bitdepth modes are visualized differently (palette support is still missing).
- Added 4, 2, 1 bit/pixel modes
Built using Lazarus 1.8 and FPC 3.0.4.
The attached binary produces 2 detections on
VirusTotal. Use it at your own risk or build from source.
History
binview_exe_win32.7z (691.02 kB - downloaded 68 times.)
binview_src_160104.7z (69.86 kB - downloaded 25 times.)