I'm trying to experiment w/ other flavors of icing and/or cakes. I'm making a lemon cake tomorrow and was wondering about the frosting. I have a recipe similar to the Buttercream Dream recipe on here, would you just substitute the vanilla for lemon juice? I went to a bakery in Birmingham, Al the other day and she had the BEST lemon frosting that I've ever had, which is kind of my inspiration! TIA
Lemon oil or natural lemon extract instead of the vanilla, and add lemon zest as well. You might want to start off with a smaller amount of lemon oil/extract, though, because that can be some powerful stuff!
I've had just fine results with McCormick lemon (and orange) extracts. Just make sure whatever you get is NOT imitation lemon extract - get pure, or natural, or something like that. You should be able to find McCormick in your grocery store; it looks like this:
http://cftest.mccormick.com/mc3stage/productdetail.cfm?id=6028
I've also heard that LorAnn lemon oil is quite good, but I haven't personally used that flavor. The LorAnn stuff is VERY VERY strong, so if you go that route take it mighty easy at first! You should be able to find it at a well stocked craft shop or a cake/candy supply store. It looks like this:
http://www.amazon.com/dp/B001EPPCVW/?tag=cakecentral-20
And don't forget lemon zest! I personally think that makes all the difference. 
I really like True Lemon. It is a lemon powder that comes in little packets (I think they also have a shaker bottle, but I haven't seen it in my grocery stores.) I find a get a better lemon flavor with this than even with a real lemon. sometimes real lemons are kind of bland and other times they're great, but they're never consistent. The True Lemon is consistent. In fact, I use it more now than I do real lemons. I even carry it in my purse and add to my water & tea at restaurants.
http://www.truelemon.com/products.html
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I then add a few tiny drops of lemon extract, but not too much because I think it gives the frosting a funny after taste and can be way too strong, but not necessarily lemony. (I have a very sensitive nose and taste buds, so other people may not notice what I do.)
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