One thing I remember about 1993 is a lot of buildings had big red noses that looked like splatted tomatoes put on the front of them, there was one near me which had it up for a couple of years afterwards.
I still have a 1999 red nose in a drawer as well, the sqeuaky one. I had a 1997 fluffy one at some point too, but that's long gone missing.
The 1993 splat ones were made for the front of cars too, I remember seeing a few of them in our area years afterwards - fading away ungracefully and looking more like a splatted yellow tomato by the end.
I think my favourite RND was 1997. I remember the Spice Girls dominating the show, performing with an "alternate" version of the group called the Sugar Lumps, which featured Jennifer Saunders as Ginger and Dawn French as Posh. There was a real buzz about the live show around that time, and I remember feeling there was a real party atmosphere with guests hanging around and popping up here, there and everywhere during the broadcast. The Spice Girls, for example, definitely performed a few times and then reappeared for some of the later sketches with Lenny Henry.
After that and as the years went on, it seemed to get diluted and guests came on to do their bit then leave. It lost that feeling that everyone who was anyone was just there, hanging out and supporting each other (and the cause) all night long.