You're right, it only outputs sync signals. Nonetheless,
it should be easy to obtain a steady color with minor modifications.My code is only a stripped-down version of Max Ibragimov's, so
it should be ok to display more complex things, if you can understand all Ibragimov's work (that's not my case

). I only took what i needed and understood from his code, given it's not exactly Arduino code and i'm not a skilled coder.
Concerning the accuracy of the sync signal, there is a bit of horizontal jitter. It could be caused by Timer0, i did not tried to stop it. Sometimes the sync is very steady, sometimes it jitters. Actually, i'm trying to cram in the arduino the TLC540 library from acleone, which uses Timer1 & 2 with my code snippet, which I modified to use Timer0. Sadly, i also need a serial link. Each time the arduino receives data, it breaks the VGA sync. For now, i only plan to use 2 168's (one for the sync and the other for serial and TLC stuff), as it only add a few euros to the price of my project.