Game: Farmville
Platform: Facebook
If you save up just enough Farmville spring eggs to buy decorations for your farm (that you intend to keep,) then this is not for you. This is for people who buy their decorations (or not if you don't want them) and then still have more eggs to redeem. When looking at which decorations bring the most profit you divide the selling price by the number eggs it cost.
(cpe = coins per egg)
The Mystery Egg = 5 cpe
The Sunny Ewe = 12.5 cpe
The Bunny Gnome = 13 cpe
The Guilded Egg = 6 cpe
The Flower Fountain = 8 cpe
The Dutch Windmill = 13 cpe
The mystery egg can be sold for 50 coins if it is not opened. That is where the value of 5 coins per egg comes from. Once it is opened the item you receive can only be sold for about 5 coins (sometimes zero.) I received a small (1/5) can of fuel, so I think that it was a waste of 10 eggs.

My suggestion is this: Buy as many Dutch Windmills as you can afford. They are tied with Bunny Gnomes in value, but for the same amount of coins, you have less items to sell and therefore less hassle. After that spend the rest of your money on Bunny Gnomes and Sunny Ewes. When you get to the point where you can only afford the mystery eggs, sell them before you open them. This is, of course, after you've bought the items that you intend to keep as decorations, because honestly, you aren't making that much off of selling the items. I just know that sometimes I have way more eggs than I really need, so I can turn the extras into profit. That's just how I like to do it. (Might as well get the most money I can out of my eggs, right?)
Earlier I published a post called
Which Easter Egg Should I Send? In that article, I said that the red egg is valued at 13 coins at the most. This is where I got that number from. If you are trying to figure out which egg to send to friends (when they request them,) that post will help you decide.
If you are seeking friends for this game please post those comments on the Facebook Gaming Friends post instead of here. Thanks. For more Farmville related articles, scroll to the "topics" section on the right side and click Farmville.