To be honest I had a much harder time to get the 09 Store Christmas Jacket & Pants (Full Set), than the 09 easter eggs, (as opposed to have to trade separate for the jacket and pants, and so shelling out in sum 2 early 09 rares for them ) I just got rather easy by the search for the store jacket and pants 2 "accidental" 09 easter animal eggs for 2 mid 09 rares.
tl;tr version:
I would either place the eggs together with the store set in the early 09 rare section, or together in the 08 section. But I personally don't have the feeling that either of those items belong in the 08 category. I lean more towards the 09 rare placement.
10 Store Christmas Winter Scarf:
I would value them at a mid or late 09 rare, they where not that expensive in the store then, and there are still plenty around. I still see many of those scarfs in the item groups of other players.
09 Decorative Easter Eggs:
http://www.chickensmoothie.com/archive/ ... ter/Items/http://www.chickensmoothie.com/archive/ ... ter/Items/We got those eggs again in 2010, and thus there are a ton of them around, I would value them at a 2010 uncommon each single egg, and a early 2010 rare for a full set of them.
Just my experience with those items, if someone has other opinions about it, please let us know.

Also something unimportant, I looked in the item archive for the "semi custom" items, but they show not up, so I am not really sure if I am just blind or they are really considered unofficial items?