Since this is the last time I'll have either the icons or the time to do this before Summer:
01. Default:

Because I can use it on most occasions, it's not offensive and doesn't push any agendas. Unless yay! Elrond can be counted as an agenda.
02. Oldest: See above
03. Newest:

Just uploaded it since I'm using it for the 50 Kinky Ways challenge.
04. Saddest:

I don't have any sad icons. I tend to do angry a lot easier than sad, but Danny doesn't look happy on this.
05. Happiest:

Mario by a country mile. He'd just played the winning rubber for Croatia in last year's Davis cup. It's also my default on the tennis account.
06. Angriest:

While the Roddy icon may look angrier, this is the one I use for situations where bad things will happen to whoever it is that annoyed me.
07. Cutest:

, well either that one or Mario.
08. Sexiest:

It's the only one of mine that's sexy in any way.
09. Most Humorous: I don't really have any funny ones. My TV one is funny because of the silly look on David Wenham's face, and the 'bothered' help one is amusing because it's Benicio Del Toro with pigeons landed on him.
10. Favorite 'ship: Don't actually have any 'shippy icons, if you don't count this one.

11. Favorite fandom: On number of icons it's Dr. Who all the way.
12. Most used: Elrond.
13. Favorite I've made: I do actually really like the "Wonder" one because that took some time and it works.
14. Favorite(s) by someone else:

By Fileg
15. Favorite of the moment: That one. Probably.
16. Favorite overall: That one, because seriously it's one of my favourite icons ever.
17. How many icons do you have total? 34
18. How many can you have? 100
19. If you could buy more space, would you? I'm going to save the money till Easter and then probably buy myself 12 months of icon space.
20. Do your icons make a statement about you? Unnerving love of Dr. Who, absolutely unsettling number of angry icons. Possibly.
21. What fandom do you have the most icons of? Dr. Who.
22. What 'ship do you have the most icons of? Rather worryingly, Road Dogg/Billy Gunn, unless Dr. Who/Tardis counts.
23. How do you categorize your icons? A pretty bizarre mix.
24. Are your icons made mostly by other users? No, actually, I thought they would have been.
25. Do you make icons? Yes.
26. Are they any good? No. Sometimes they work well though, and that will do for me.
27. Animated icons are... a good idea sometimes. There's still a few I want to make.
28. In general I think icons... a fun way of dealing with pictures and words and conveying information.