I wanted to see if I could simulate TeX- and LaTeX-related logos in TW5. I could not find anything in web searches or in the TW google group, so I came up with a basic solution using plain html and css. (Credits:
This is implemented by a macro tiddler and a stylesheet tiddler. Here are the macro names and their output on my system:

I have attached the two tiddlers for the use of anyone, now or in the future, who is looking for a way to simulate these logos in TW5. I'm not sure how stable the appearance of these logos will be across different fonts, browsers and operating systems; YMMV, and some tweaking of the stylesheet tiddler may be necessary.