There are a couple of new ones that are F2P. They include the Heraldic Helmets, Willow and Yew Composite Bows, and the Mage and Strength Anmy (T). Did I miss any?
I'd estimate 600gp - 800gp each, typically 750 each. You do realize they're used in Stat Restore, Super Stat Restore, and Weapon poison (+), and not just regular Strength Potions right.
Updated once again with 13 new costumes!! Deadline is coming up fast! Don't forget to submit your costumes before December 25th!!! And if you PM'ed me or posted about costume changes, double check that I made those changes because it got a bit hectic with all the messages I got. I may have missed 1 or 2.
Well now that I think of it, you only need that quest when you start to help the Mourners (you recolour the sheep). It may not be required to start it and talk to the elves.
It's basically a short quest that doesn't count towards Quest Points or anything. They usually have some kind of small reward as well (Ghostly Robes, access to Abyss, etc.). I can't find any compilation of miniquests, but RuneHQ sort of does: http://runehq.com/RHQMiniQuests.php
Ya the temple at Ape Atoll is great. I second what micbar said, but watch out for their ability to block movement. You can't run through them so don't get surrounded!
No, the only time you check for health and get experience is when it's fully grown for the first time. But yes it does regrow, just like a real tree =D!
I've seen people do this before with coloured robes and such. It IS a big hit if it's a new update and people want the clothes without having to travel so far, but typically you cannot make very much money by selling clothes, even ones that are a little bit harder to get. Try treasure trail items instead.