DH's cousin just sent me a message on FB saying that once we find out what we're having, she would love to come help us paint the nursery and paint a mural on the wall. Very nice right? Well the thing is, I would love the help... but what happens if we let her paint a mural and it ends up looking like total crap? 

 I really appreciate her offer because she wants to do something nice for the baby,  but if we don't like it we would be stuck with it forever.                
           
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Re: Nice gesture? WWYD
Haha! I totally understand! When we bought our first house, we toyed with the idea of letting family/friends help us paint rooms by having a painting party. But then we thought, what about the ones that are not as neat as we would like them to be! So we nixed the whole idea.
Just tell her you don't think you like murals!
Thank her, and then tell her you would love to have her help painting the room, but having a mural is just not what you invisioned for your nursery.
What were you planning on doing before she offered? Painting the walls? Painting a mural yourself? If you weren't doing any of this, just tell her. If you were just going to paint, maybe she could help with just that. If you're concerned about how a mural would look, I would want to be there during the process, to quality check.
Thanks guys! You have such great ideas, I knew you would know what to do. lol... it's true, we do want the rooms to "grow" with out kids so a mural wouldn't work for later on. BRILLIANT! haha
I'm an artist... and the flipside of your question is... what if we LOVE it and it turns out beautiful... we would ALSO be stuck with it forever.
Repainting is something you are going to want to do eventually... If your friend is an artsy person and she wants to contribute her time and talent- why don't you see if you could encourage her to put the art on something other than the painted walls... either a framed panel/canvas... a piece of furniture- like a child's step stool or lamp... or perhaps a large panel alternative like a large japanese screen. You can shape her request in a way that will suit you better- but won't hurt her feelings.
Tell her you are trying to keep the room neutral so LO can grow with it but that you would love love a canvas panting to hang on the wall!
This! haha