I have stumbled upon a weird feature in Skype - colored text:
How do I achieve this? Are there available any special tags?
Found out on my own. You can use the standard HTML tag 'FONT' with the 'color' attribute, like this:
And to post it you have to hold Ctrl + Shift and click with the mouse the Send button. I've checked and there are available additional 'FONT' attribute 'size' and 4 more tags: 'U' [underline], 'I' [italic], 'B' [bold] and 'BLINK' [obvious]. The image on the screenshot above is made programmatically, on img4skype.com. Source.
UPD: Doesn't work since 184.108.40.206. Though, if you send the code from an older version, it will render properly in the new ones as well.