I have created a version of Collapsed Topics with the abilty to set the colours of the toggle as requested by Leonie Vos and documented on CONTRIB-3529.
If you have Moodle 2.2, please be so kind as to test the pre-release by obtaining from 'https://github.com/gjb2048/moodle-format_topcoll/zipball/CONTRIB_3529'.
Usage is the same as before with the new additions hopefully being self explanitory when you edit the 'layout' - now called 'settings'.
Once ok, I will put into full releases for Moodle 2.0, 2.1, 2.2 and 2.3. Possibly 1.9 if demand is great but as 1.9 is reaching end of life I would suggest you upgrade anyway .
Feedback appreciated, cheers,