I think it's pretty clear to most here that Carlton introduced a wonderful set of idents in 1999 compared to the dross that had gone before.
I'm going to stick my neck out and say that the 96-99 set of idents were actually rather good. Sure, they're not in the same league as the 99-012 ones, look like they were made in Adobe Flash and will always be tainted by association of having sister Central versions which killed off the cake but they were colourful, highly varied and had a lot of charm to them. Designed by Lambie-Nairn (like the 99 set) it was recognised that Carlton not having a symbol, their own equivalent of the Granada 'G' arrow or Yorkshire chevron was a bit unfortunate; so instead, they put the emphasis on the letters, with quite some success in my opinion. They weren't without issues; some individual idents like the upside down Home & Away one were withdrawn early after being deemed too obscure, whilst at least one was purported to have given people seizures and there were so many different length variation plus the widely different variations of the jingles meant they must have taken some getting used to by the continuity announcers. Still, they certainly weren't dross.
The short-lived ones that immediately preceded them from 1995, made by Central's presentation department, were dull as hell. The people idents they launched with were cheesy and I don't care much for them but in a way they were ahead of their time, as short films featuring people would become mainstream for idents. The celebrity idents from the first homogenised ITV look in 2002 bear more than a resemblance to them and so, for London viewers, the whole thing kind of came full circle.
The '99 set was Lambie-Nairn's second stab at sorting Carlton's branding issues out. With mixed results from focusing on the letters to compensate for the lack of a symbol, the decision was made to just go for it and create a symbol: the Carlton star. And it was executed wonderfully; only to disappear a little over 3 years later due to pan-ITV branding. Tragic really but then being cut down in their prime might have done it a favour. Like BBC Two after their 91-01 set, it would've been tough for Carlton to have replaced that set with anything anywhere near as good.