As far as I know, just fading the sidebar and/or putting up a custom sidebar (have one - needs updating for the new Neo sidebar ... again) is ok. What I have seen people get in trouble for is disabling links - any of the sidebar links, including the search and link to us little link at the very bottom of the sidebar.
If you use the css to just get rid of the yellow/words, you'll still have the clock, search and link to us I believe you should be ok. The links don't show up, but if you cursor where they would be, they do show up and you can click on them to navigate. I would recommend writing into support if you're really nervous about it.
To guilds - No contests of any kind, no raffles, no giveaways (including MOTW, MOTM, birthday, new member, etc.) are allowed - period. The word prizes is even a no-no. You can't offer a "prize" for anything.
From #3 of the T&C:
Quote:
promotions offering prizes of any sort (including contests, raffles, lotteries, chain letters or any kind of giveaway)
Our guild leaders wrote to support separately many times asking basically the same questions and got the same answers from different support staff when the No Contests Rule was decided to be enforced. Our guild did have contests at one point - they were fair, no one was scammed, everyone was very happy with them and they were fun. We had one where people had to send in an item worth up to a certain np amount, with a specific theme. Then one person was picked and that person got everything that had been sent in. I believe that everyone who participated in that one ended up getting all the items at least once, so no one was "out" anything.
We also had a random Member of the Day, as well as MOTM, birthday packs, new person packs, guild "pharmacy" for sick pets - they were told none of those were allowed as they are technically Giveaways. As a result of shutting everything down, our guild has become a very inactive place, but there's nothing to be done. Better to follow the rules and have a "boring" guild, than a deleted guild - Yes they WILL delete a guild and a frozen council/people running any type of contest.
The Neopets Magazine a couple of issues ago now had an article about guilds, and even there they said no contests, giveaways, etc. I think donation shops are frowned on too, because if you're not having contests, etc., the only thing a donation shop is good for is either a) saving up for the message board or unfortunately b) getting alot of np then the person in charge closing the guild ... which I have seen many people complain has happened.
Again, I would write to support and just ask what is and is not ok to do.