Long story short, a person I know was messing around with the Knowledge base picture URLs after he read the find about the icon for the Construction skill being leaked.
After a while of messing around, he struck gold. Jagex has leaked another picture.
MUCH more meaningful than an icon.
Edit: As many people are complaining that they STILL cannot see it (try pasting the URL into your URL box and pressing enter) people have kindly provided an Imageshack link. Just in case anybody out there *doubts it* thinks it's a fake, there's still a link to runescape that STILL does lead to the image.

www.runescape.com/img/kbase/skills/construction/screenshots/construction_intro.jpg
If the picture doesn't work, right click the picture and select View Image (Firefox) or Show Picture (Internet Explorer)
This is NOT a fake because the link is off the knowledge base.
Soo, what's in the picture?
Well obviously, it's a player owned House. So there seems to be either a default number of house areas (3) or you can choose how many which will probably require more in the construction skill.
There IS a purple portal that may be made out of different logs. The portal, I suppose is the entrance, exit to the POH.
Flowers (sunflower, tulips, rosemary, farming-related items) and personal trees (2 willows in the background) are also probably able to be grown using the farming skill.
And a last thing. My friend, who had gone on a hex-editing site posted here before on a topic that went on for 6 pages to discuss it.
He showed me the info on some of the items that were there. Quite a lot seemed to be related to POH. Things like banner painting rack, armor display, portal, oak - maple and gilded altars to either Zamorak, Saradomin, or Guthix. Then, slayer monster heads, and KBD + Kalphite heads.
Discuss.