Recently I was prompted by two ideas.
One is 'reputation' script (or 'Karma' on this forum) - users can vote for other users, and see their reputation.
And other is 'lexicon' script - bot is counting words sayed by users, and show it by the command:
[08:27:18] <sphinx> !lexicon [somenet]user
[08:27:21] <Bot> sphinx: lexicon [somenet]user contains of 1083 words. Most popular are
you:109 are:96 I:54 http:35 maybe:28 sleep:25 jpg:25 tiera:25 me:23 src:22
I think it can be intersting to create such scripts.